List of goofs/Season 1

Tourist Trapped

 * In this episode, Gravity Falls is shown to be in the center of Oregon, but in subsequent episodes, Gravity Falls is shown to be in Eastern Oregon.
 * Corvallis is spelled "Corvalis" on the map of Oregon.
 * While Dipper is reading from Journal 3, he reads "studying" even though the book said "researching."
 * The hand on the cover of Journal 3 alternates between five and six fingers in several scenes.
 * The triangle stained window is centered with a double ring from the inside, but from the outside it has a single ring.
 * When Dipper is showing Journal 3 to Mabel, the page Dipper wrote at the end of the episode can be seen, even though he hadn't written that page yet.
 * The order of the pages in Journal 3 are different between the first time Dipper opens the Journal and when he shows Mabel the journal when he attempts to convince her that Norman is a zombie.
 * When Mabel goes to meet Norman at the shack's front door, the words "Meow Wow" on her sweater frequently disappear.
 * When Dipper and Mabel are being chased, a rear shot of the back of the Mystery Cart shows that Dipper's hat is missing despite it being present in the preceding and following shots.
 * After Dipper and Mabel crash the Mystery Cart, its position moves several times throughout the scene.
 * When Mabel is responding to Jeff's proposal, Jeff's beard is red instead of brown.
 * When Mabel says "You may now kiss the bride," the leaves in her hair disappear, but after they shoot Jeff away the leaves return.

The Legend of the Gobblewonker

 * When Mabel says "blah" after coughing on syrup, her mouth doesn't move.
 * During Mabel's daydream with the hamster ball, Xyler has blue framed sunglasses and Craz had pink framed sunglasses. After Mabel talks to them, they both have pink frames.
 * Stan's license plate reads "STNLYMBL" which is 8 characters long, but in the state of Oregon, the maximum number of characters allowed on a license plate is 6. Even if Stan kept the license plate on the car from New Jersey, the maximum number of characters is 7, still too short. (This could also mean that Stan's car is illegal.)
 * Stan is on his boat with nothing but then appears to having a fishing box with him the next scene.
 * As Dipper says "change of plans," to Stan, a gap opens in the line that makes up Mabel's hair, only to vanish a few second later.
 * The last two letters of Dipper's fishing hat are missing when Stan gives them to him and Mabel, but later all the letters are back. (Although this may imply multiple fishing trips, due to some pictures showing earlier times of the day.)
 * When Old Man McGucket says "Aw, banjo polish!" when he was leaving the screen, his mouth didn't move.
 * In one scene, Dipper brings his hand down on a cooler, smashing a camera. However, in the previous scene, the cooler is behind him.
 * When Soos grabs Dipper by the top of the life-jacket when they are running away from the Gobblewonker, one shot shows Dipper wearing the life jacket, and it is raised up so you can see his stomach. However, when the shot pans out, the shirt that he is wearing under his life jacket covers up his stomach.
 * When the boat drives through the glass pane, the robot Gobblewonker disappears until Soos, Dipper, and Mabel are about to crash in the cave.
 * When Soos is throwing the cameras at the Gobblewonker, some cameras randomly appear in his hand.
 * Before Dipper took the first group picture you can see Soos' arm, but in the picture you don't.
 * When Soos loses his shirt, it reappears during one of the fishing pictures and disappeared again after the pictures. (Although this may imply multiple fishing trips, due to some pictures showing earlier times of the day.)
 * There should have been 3 cameras left, since only 14 cameras were lost and broken.
 * Soos should not have been able to throw 6 cameras, because he had 4 to start with and had already thrown 3 away even with the 3 in the extra bag it would not be enough.

Headhunters

 * Wax Larry King is first shown to be the same height as Wax Sherlock Holmes, but in another scene he is much shorter.
 * Mabel's eyebrows and eyelashes are missing just before she says "Are you saying you could outwit Duck-tective?"
 * Mabel's drawings of her sculpture ideas had color, but she was only using one regular pencil.
 * Shandra Jimenez can not be seen among the crowd at the re-opening of the Wax Museum of Mystery, but she appears when Mabel calls on her for questions.
 * When Sheriff Blubs and Deputy Durland are laughing at Dipper, Wax Stan briefly disappears.
 * When Mabel leans forwards to say, "Even us!" the button on her disposable camera disappears.
 * The footprints with holes are the right ones, but the first left footprint has a hole while the first right one does not.
 * Dipper and Mabel make a scribbled line on Mikey R.'s row on their checklist. However, in a later scene, this mark is instead shown on the Angry lady's row.
 * When Deputy Durland and Sheriff Blubs raid Toby Determined's office, Deputy Durland says "Derp" without moving his mouth.
 * When the security footage of Toby is shown the first time, the clock starts at 10:00 and the seconds are at 1. But the second time it is shown, the seconds are back at 0 and the clock still says 10:00.
 * In the flashback where wax Sherlock Holmes decapitates wax Stan and he looks at the head, the design on the hat is missing the little triangle.
 * The wax figures say they come alive during a waxing moon, but the moon shown during the fight between Dipper and Wax Sherlock Holmes is waning.
 * When Stan regains Wax Stan's head after the battle, the color of the band on the back of his fez changes color for a few frames, from yellow to red, and then it goes back to normal.

The Hand That Rocks the Mabel

 * At one point, on the outside of the Mystery Shack the sign says "World Papov" instead of "World Famous."
 * When Mabel blinks, the "bezazzles" on her right eye fall off, but they later return.
 * Before Mabel shows her makeover to Dipper, Dipper's book appears to be Journal 2 instead of 3. The book labeled 2 belongs to Gideon Gleeful, so this is impossible. Alex Hirsch acknowledged that this was, in fact, an animation error.
 * When Mabel complains that Dipper never does girly stuff with her, Dipper sets Journal 3 on the chair, but when Soos enters, the book is gone.
 * In the shot of Dipper and Mabel playing video games, the collar on Mabel's sweater has stripes. In all the other shots, it does not.
 * When Gideon and Mabel are on their date, we never see Mabel's glass filled with water and yet when the waiter leaves, it is full of water.
 * When Stan tells Mabel that she has to marry Gideon, the symbol on his fez is missing.
 * When Bud enters Gideon's room, the photo Gideon burns is not shown on the door.
 * When Dipper and Mabel are playing with Soos, Mabel is wearing a sea-foam green-colored headband, but when Dipper hears the phone ring, her headband changes to red, then back to sea-foam green.
 * When Mabel and Dipper are sitting on the chair, the umbrella on Mabel's sweater is disappears, then reappears partly.
 * The three journals all have 4 gold corners on the front cover in each corner. When it is revealed at the end of the episode that Gideon has Journal 2, the bottom left corner is red instead of gold when he closes the book.
 * During the end credits, there are a number of errors.
 * Soos, Mabel and Dipper are using a flashlight, but it did not cast a shadow.
 * When Soos spins to the side with no jewels on it, the wall still has the disco ball effect.
 * The light reflections rotate in the opposite direction Soos is spinning.
 * The lights on the wall travel much slower than Soos is rotating.
 * In a frame when Mabel is wondering how Gideon Gleeful found out her name all but one of her teeth are missing.

The Inconveniencing

 * When Dipper high-fives Wendy, he does so with his right hand, but in the following shot he is using his left hand.
 * When Dipper is seen with his clipboard in the background, his pen is in his left hand. In the next shot, it switches to his right, and then back to his left in the next shot.
 * Tambry is not present in the minivan when Thompson drives the gang to Dusk 2 Dawn, even though there was a seat next to Mabel and Dipper.
 * When Mabel says "This is going to blow someone's mind," the pine tree on Dipper's hat is outlined in black.
 * The fence surrounding the Dusk 2 Dawn changes height from shot to shot.
 * When Dipper is trying to climb over the fence, Lee is on the same side as everyone else, the same side as Dusk 2 Dawn. However, before he pushes Dipper off the fence, he seems to be climbing from the outermost side of the fence, as if he were going in.
 * When Dipper is opening the vent to get inside, Tambry's leggings briefly vanish.
 * When the newspaper is on the stand, the title reads USA WEEK, but when Dipper rubs off the dust, the title says USA NEWZ.
 * When Nate and Robbie are putting ice in Thompson's pants, Robbie is missing his pimples and piercings, and his nose is the same color as his skin.
 * When the three teens' reflections are shown in the window as normal, Tambry's reflection is smiling, but Tambry herself is not.
 * In the same shot, Tambry's leggings are missing.
 * Robbie's reflection is not mirror-imaged.
 * Wendy's mouth is not mirror-imaged.
 * Thompson parks the minivan outside the fence when they arrive, but when Pa opens the doors, the minivan is inside the fence. When the teens leave, the minivan is outside the fence again.
 * Ma and Pa Duskerton collapse from heart attacks by the window near the front door, but their bodies are chalked near the end of the store.
 * In the chalk outline, Ma's arms are sprawled out, but when she collapsed her arms were on her chest.
 * When Thompson is first seen playing Dancy Pants Revolution, the arrow that points left is white. When he gets trapped in the game, it is pink.
 * When Dipper does the Lamby Lamby Dance, Ma's name tag is on her shirt, but when he finishes, it is gone.
 * When Wendy is telling everyone about how Dipper saved them, the mud on her boots is at the top, but in another shot, the mud is on the bottom of her boots. In the same scene, Dipper has a peach-colored nose instead of a red one.
 * The open and closed sign changes from open to closed many times in different scenes.
 * When Dipper is being booed by the teens for not wanting Nate to lie in the chalk outline, Robbie's guitar is on the side of the desk with the cash register. In the next scene, the guitar is in front of it.

Dipper vs. Manliness

 * When Sheriff Blubs is eating pancakes, he appears to be almost done. However, in a later shot, more pancakes have appeared.
 * In the shot where Stan and Mabel laugh at Dipper, the Manliness tester's sign says "Manliess."
 * Dipper throws down the beef jerky on the ground and Chutzpar eats it. In a later shot, the jerky has disappeared.
 * When Soos runs out the door, the door moves a little and then stops, but the style of the door and its position makes this impossible.
 * When Mabel gets an idea, Soos' shirt is pink, but when Mabel gets up his shirt is back to normal.

Double Dipper

 * When Stan tells Soos that it's no one's birthday, his bow tie disappears.
 * When Mabel sprays her silly string at Dipper in the copier room, the string comes out of the side instead of the nozzle.
 * When Dipper drops his spray deodorant, the appearance of the can changes.
 * When Dipper reaches for his spray deodorant, there is no can on the box. In the next shot, a can appears.
 * Some of the people from inside of the party reappear in the line by the ticket stand.
 * One of kids near the front of the line is missing arms.
 * When Wendy leaves Dipper to man the table by himself and she starts dancing inside, for a few frames her left shoulder is filled red.
 * When Mabel was dancing, there is a chair next to Candy Chiu but in the next scene, when she sits down to drink water, the chair disappears.
 * When Grenda says, "Hold me, Candy," Mabel has two right eyebrows. As she turns to face Pacifica, her upper eyebrow comes down and vanishes into the lower one.
 * Robbie plays his electric guitar despite the fact it is not plugged in to an amplifier.
 * Tambry's hair is drawn mirrored for the entire episode.
 * When Wendy tells Dipper she and Robbie are going to go sit on the couch, Dipper's bow tie is missing.
 * When Paper Jam Dipper emerges from the paper, part of his shoe is missing for a frame.
 * When Dipper is telling Soos that someone stole Robbie's dirt bike, his colors are faded like the clones'.
 * The "Wendy Mix" starts playing before Clone #10 puts it in.
 * When Dipper bends down to pick up his cup, there is a chair, but when he stands up the chair is gone.
 * Pacifica is shown to be on the dance floor when Wendy is waiting for the bathroom. Moments later, Pacifica emerges from the bathroom.
 * When Pacifica Northwest comes out of the bathroom, her colors are faded.
 * When the clones confront Dipper while Wendy is in the bathroom, the copies of "Wendy Plan B" are the same as the first plan.
 * The red spreader stick in the crackers and cheese snack is not visible in the package, but it appears in Dipper's hand.
 * Dipper sets off the fire sprinklers with smoke from a party popper. However, fire sprinklers are activated by heat, not smoke.
 * Right before Dipper and Tyrone say, "We blew it, man," Tyrone's hand is a frame early for several frames, causing his hand to be severed.
 * In the last scene, the Mystery Shack's address is written as 616 instead of 618.

Irrational Treasure

 * Mabel's nacho earrings appear and disappear from shot to shot.
 * When Stan says "I will break you, Little Man!" to Toby Determined, the line between his eyes (part of his glasses) disappears.
 * When Gompers is at the wedding ceremony, his right horn is broken instead of his left horn.
 * The microphone on the podium appears and disappears from shot to shot.
 * When the Northwest family has their picture taken, the Nathaniel Northwest statue changes from facing left to right. Later, it faces left again.
 * While Dipper and Mabel read about the conspiracy in front of the statue, the bottom of Dipper's shoes change from white to black.
 * When the statue of Nathaniel Northwest is first seen, it is in front of a church. However, when Dipper is reading 3, there is a group of trees behind the statue.
 * When Dipper removes the document, the red spots on Mabel's cheeks disappear.
 * When Dipper is going through the slides in the library, one is entitled "Numerology," but contains astrological symbols.
 * When the twins exit the museum, the right hand door is open, however when the officers leave, the other door is the only one open.
 * Mabel's mouth doesn't move when she laughs after Dipper says to look out for "booby traps."
 * In the top secret document that reveals Quentin Trembley as the founder of Gravity Falls, in the second paragraph, the "Falls" in "Gravity Falls" isn't capitalized.
 * While watching the video, Mabel's eyebrows raise in surprise at the revelation that Quentin Trembley was once president. Her expression then shifts to confusion and her left eyebrow curves down onto her eye, but the surprised eyebrow is still on her face, giving her three eyebrows.
 * Quentin Trembley's expression changes throughout different scenes while inside the block of peanut brittle.
 * When the twins and Trembley climb the ladder to the top of the train, they are in the rear car. However, when they emerge on the top of the train, there are more train cars behind them.
 * When the trio are trapped in the crate, it has a roof, but just before it falls apart the roof disappears.
 * When Dipper is running towards Pacifica to tell her about Quentin Trembley, Mabel's headband disappears.

The Time Traveler's Pig

 * The caramel apple Mabel feeds Waddles disappears after she drops it.
 * When Mabel sat on the Test Your Strength game, the marker did not move when she got off, but it should have gone to 0 since it is impossible for Mabel to weigh 0 pounds.
 * Mabel's eyes are parted in the middle in one frame.
 * Dipper's question mark corn dog disappears when Robbie shows up.
 * When the Unnamed hillbilly throws balls at the dunk tank, his right hand is shown with no half-finger missing.
 * When Wendy first sees the stuffed animals, they are seated on a board, but in all of the other shots, they are hanging on a rack.
 * When Waddles is dressed as a doctor, his nose color briefly changes.
 * When Dipper and Mabel are talking to Blendin, Dipper's hat turns navy blue instead of its normal shade of blue.
 * When Blendin's "position is compromised" after he failed to hide, his watch switches from his left hand to his right hand.
 * After Mabel hands Blendin tickets to the fair and he leaves, Mabel turns to the side, and the flower in her hair has vanished.
 * When Blendin walks to the barrel ride, the time machine is not on his belt. When the camera zooms in, it is.
 * When Dipper and Mabel high-five each other in the Mystery Shack, Mabel's braces and dimple marks are missing.
 * After the fire from the first do-over created a mark on Dipper's hat, it remains there for the rest of the episode. In some scenes, however, the burn mark disappears. For example, the burn mark is not present while Dipper is doing calculations on the glass.
 * When Mabel is riding the Ferris wheel with Waddles the ticket booth in front of the Ferris wheel is facing to the right. In all the other "do-overs," it is facing toward the front.
 * When Robbie talks to Wendy in Dipper's final do-over, there is a frame in which his teeth are skin-colored as opposed to white.
 * Fertilia's baby sports an adhesive bandage on its cheek, but they were not invented until the early 1900s.
 * When Mabel loses the flower in her hair, it reappears on the other side of her head.
 * When the twins travel to opening day of the fishing season in "The Legend of the Gobblewonker," the sign says "Fishing Season," but in the actual episode it said "Fishing Season. Opening Day."
 * In the flashback of the events of "The Legend of the Gobblewonker," Soldier Kid and Pizza Guy are seen, but they did not appear in that episode.
 * In the flashback of the events of "Headhunters," Pizza Guy is wearing a green shirt, but in the actual episode his shirt is red.
 * When Dundgren is talking to Blendin, there is a frame in which his pupil is colored light green instead of black.
 * When Stan laughs at Robbie, his finger leaves the border of the dunk tank.

Fight Fighters

 * In some scenes Robbie has five fingers while in others he has four.
 * When Wendy and Robbie play the game they are moving the joy stick and pressing the buttons, but in the next shot there is nothing happening in the game.
 * When Mabel wins the crackers in the card game, nobody else had any. However, in the next scene, Dipper and Stan both have more crackers.
 * When Stan complains that Mabel doesn't know what game they are playing, Mabel's mouth closes without any animation.
 * When Robbie pushes Dipper down and then walks away, the trash cans and Dipper's hat disappear. They then reappear when Stan comes out.
 * When Robbie leaves the Mystery Shack, his cellphone and amp disappear.
 * When Stan sees the skydiving show, his mouth animation is shown in two places simultaneously for one frame.
 * When Stan falls backwards away from the TV, he trips over the dinosaur skull onto the floor. However, the wall is usually too close to the dinosaur skull for Stan to be able to lie on the floor behind the skull.
 * When Dipper is following the instructions "to unleash ultimate power," he only presses the punch button twice, even though the instructions said to press it three times.
 * When the Fight Fighters game turns off before Rumble comes to life, Dipper's hat turns solid blue.
 * As Dipper and Rumble are walking downtown, a barber shop can be seen in the background. When Rumble swings the pipe, a poultry shop is visible behind him. In the next shot, the barber shop again replaces the poultry shop.
 * After Rumble chases Robbie away, a poster for Robbie's band appears on the tree behind him, even though it wasn't there before.
 * Rumble shoots a blue fireball at Dipper, but in the next shot, it's red.
 * Rumble says that he doesn't have "looking up animation." However, he looked up at Robbie when he was hiding in the water tower.

Little Dipper

 * When Mabel and Dipper are playing chess, Mabel moves a black pawn and Dipper says it is not her color (implying her color is white). He then uses a white pawn to take out the black king.
 * When Dipper kicks the shelf to get Journal 3 to come down, the hand on the cover only has five fingers.
 * When Mabel charges into the attic, the closet door is open. When she suspects a wizard made Dipper taller, the door is closed.
 * When Stan knocks the jar of termites out of Gideon's hands, it falls on the porch. When Gideon runs away, it is in the doorway.
 * During the flashlight duel, Mabel and Dipper do not flick the crystal, but the beams change from grow to shrink and back again numerous times.
 * When Dipper and Mabel are fighting over the flashlight, the caterpillar runs over a couple of cars. When Dipper and Mabel drop the flashlight, the cars are gone.
 * The jar in Gideon's breast pocket appears and disappears from shot to shot.
 * When Mabel is in the bag of Gummy Koalas, her headband is missing for a shot.
 * The Gummy Koala candy bag has a net weight of 5.29, but it later changes to 6.29.
 * In the mirror, Stan's tie is not reflected.
 * Before Stan places his fez on the dresser, the fez symbol is not reversed in the reflection.
 * Soos' brown hair is gray in the mirror.
 * The photo of Gideon on his ID card shows him with only four fingers per hand.
 * When Dipper and Mabel tickle Gideon, the pine tree on Dipper's hat is missing.

Summerween

 * After returning from the Summerween Superstore, Dipper and Mabel are on the floor in front of Soos, with many items such as scissors, a pencil, and glue, but when Soos is telling them to be careful, everything disappears. Everything reappears when Soos tells the twins about the Summerween Trickster.
 * After Mabel finishes talking about previous Halloween costumes, Dipper eats a piece of candy, and while he is choking, there is a moment when Dipper's back part of his hat is not blue; it blends in with the wall behind him.
 * When Dipper is shocked to see Wendy with Robbie, he drops some candy from the bowl on the ground. When Wendy comes into the Mystery Shack with Robbie to get her jacket, no candy is seen on the floor.
 * Waddles has a light brown/tan spot on his left eye rather than his right eye in this episode.
 * Candy's mouth vanishes when Dipper comes downstairs.
 * A shot of the trick-or-treaters before Mabel and Dipper leave has many errors: Gorney, Candy and Grenda are shown trick-or-treating, even though Gorny was eaten and Candy and Grenda are at the Shack, and Waddles is with some random kid even though he should be at the Shack.
 * When Dipper was wearing his Peanut Butter costume, his birthmark on his forehead isn't visible throughout the entire episode.
 * When the kids are looking up at the roof of the Mystery Shack after the Summerween Trickster is gone, they are standing in a line with Grenda closest to the left of the shot, then Candy, then Dipper, then Mabel. In the next shot, Dipper and Mabel are farther apart and Grenda is standing behind them.
 * Dipper's watch says 6:00 after they meet the trickster, and it is dark. However, that part of Oregon on June 22 would not have a sunset until about 8:50 pm.
 * When the Summerween Trickster first checks up on the group, for a few frames after he jumps off of Soos' shoulders his skin color becomes bright purple.
 * When Dipper and Mabel dance in front of the Bats Biker's house, their treat bag is missing. It reappears when they receive candy.
 * When the Summerween Trickster goes into the store for the kids, he tears the door off of Soos' car. When The kids run around behind the Trickster, the car still has its door.
 * Waddles' light brown/tan spot have been replaced with pink spots when he's eating the candy out of the bowl.

Boss Mabel

 * Dipper leaves the window open after he grabs the mace and falls out, but in another shot, the window is closed.
 * When Mabel first enters the gift shop with Soos, Dipper and Wendy, the jar has a red line on it. Later, after Dipper leaves, Mabel draws the red line and claims that they will fill the jar with "one hundred billion dollars."
 * When Mabel is holding the Questiony the Question Mark costume, it is pointed like a normal question mark. When the shot changes to the other side of her, it is facing the same direction, even though it should be reversed.
 * When Soos is talking to the woman in the Mystery Shack, his Questiony the Question Mark costume is inverted.
 * Tambry is drinking a can of Pitt cola. In the next shot, the can is gone and her hair has been inverted.
 * When Mabel is yelling at Soos and Wendy, Wendy is briefly floating above the ground with no shoes or legs.
 * When Mabel stands in front of the mirror wearing Stan's hat, the fez symbol is not reversed in the mirror.
 * When Dipper puts on his hat on over his combed hair, his hair is rearranged, but in the next scene, when he is counting money, his hair is combed again.

Bottomless Pit!

 * When the bouncer is talking to Dipper, his tattoos are black in the front and back. The shot changes to a view of his back, where the tattoos are colorful. When the shot changes back to the front view, his tattoos are all black again.
 * When the bouncer talks to the people from the bar, his belt is higher than it is in the preceding and succeeding shots.
 * When Dipper asks where his spaghetti is, the spaghetti plate has a fork. When Stan turns around, the fork disappears.
 * When Sheriff Blubs is telling Stan that there is no Doctor Medicine in Gravity Falls, Stan’s burn mark is replaced with back hair, but it returns moments later.

The Deep End

 * One of the water balloons that Wendy throws changes from blue to red between shots.
 * When Stan is telling Soos about the perfect chair, another chair is seen behind Soos, which disappears in a later shot.
 * In the shot where Mr. Poolcheck is telling everyone that the pool is closing, Gideon is on a different chair than the one he stole from Stan.
 * At some points in the episode, Mermando's mustache hairs switch places on his face, and the number of them change from three to four quite often as well.
 * Stan's watch reads the same time upon entry and exit of the pool jail, despite being in there for two hours.
 * The first time Mermando plays his guitar, he seems to be left-handed. But the second time, during the night, he plays it as if he were right-handed. If he were ambidextrous, he would have had to restring the guitar to play it with either hand.
 * When Dipper is giving Mermando "reverse CPR," the water bottle he is using fills back up with water every time he drinks from it.
 * When Mermando's bottles for Mabel jump out of the water, the word "Mabel" changes to "Lebam" which is Mabel backwards. They then turn back to Mabel.

Carpet Diem

 * The pillow that Grenda throws at Candy in the first slumber party scene is pink before she picks it up, at which point it turns green.
 * When Dipper first lies down outside, his pillow is about a meter from the totem pole. In the next shot, Dipper is leaning up against the totem pole without having moved.
 * The glitter on the pizza Mabel offers Dipper disappears in the following shot. In the shot after that, the pizza disappears.
 * Before Dipper reads "Experiment 78" the tag with that sentence is on the center of the carpet; as he reads it the tag is on the border. In the close-up of the tag with electricity around it the tag is on the center again. Later, when Dipper reads the entire tag, it is on the border again.
 * For a split second, when Dipper (in Mabel's body) is screaming while looking at the mirror, one of his eyebrows disappears.
 * In one of the shots where the twins are discussing the body swap, their reflections are not seen in the mirror.
 * The cereal box that Dipper (in Mabel's body) pours over himself is not present until he picks it up.
 * The arrows on the Electron Carpet switch from counter-clockwise to clockwise at some points.
 * When Old Man McGucket chases Soos (in Waddles's body), the puddle of mud disappears.
 * When Waddles (in Soos' body) is eating the tissues, a tissue is seen on the corner of the table, which disappears when Stan enters the room.
 * When Mabel and Dipper are tackling each other in their room, the mini Eiffel Tower that Grenda broke at the beginning of the episode is perfectly fine.
 * When Dipper first enter the room he read the back of the carpet's tag which says "Experiment 78." After switching bodies the back of the tag says "Electron Carpet."
 * When Dipper and Mabel return to the attic after having switched into their proper bodies, the Eiffel tower is intact despite the fact that Candy broke it at the beginning of the episode.

Boyz Crazy

 * The radio on which Robbie plays his CD disappears when Robbie and Wendy walk out of the gift shop together. It then reappears in the next shot.
 * When Wendy leaves the gift shop with Robbie, she zips up her coat, but it is unzipped in the next shot.
 * When Mabel, Candy and Grenda meet Dipper in the gift shop while he is inspecting Robbie's CD, Grenda is not wearing lipstick. In the following shots, she is.
 * When Stan turns to tell Dipper a story about music, the design on his fez is different for a split second.
 * When Mabel, Candy, and Grenda are heading towards the dressing room, a crate in the foreground is missing a side.
 * When Candy, Grenda and Mabel find the boys inside the cage, there is a frame in which Candy's skirt disappears.
 * The flower that Ergman Bratsman steps on while visiting the Mystery Shack in search of Sev'ral Timez is missing when he drives away.
 * When Dipper starts to play the record of Robbie's song backward, the speed on the record player is around 6.5. In the next shot, the speed has changed to 45.
 * When Mabel apologizes to Grenda and Candy, in one frame her mouth disappears.

Land Before Swine

 * When Deputy Derland is solving the maze, one of the shark's teeth is gold. In the next shot, it is white.
 * The piece of Stan's pant leg that Waddles is eating disappears in the following shot.
 * The children in the tour Stan is guiding are not carrying gift boxes until they see the "Cornicorn," at which point they suddenly have boxes, which they angrily throw at the floor.
 * When the pterodactyl is diving at Stan and Waddles just before Stan straps Waddles to his back, the Huggy Wuvvy Tummy Bundle is nowhere to be seen.
 * When running from the pterodactyl, there is a frame where Stan has two mouths.
 * When Stan, Mabel and Waddles are playing poker, Stan says he has 4 aces. This is impossible since only one other ace was on the table.

Dreamscaperers

 * In the memory of Stan's date with Susan, they're eating dinner and a set of food is placed in front of them. After Stan throws his plate onto the ground, as Mabel is about to close the memory's door, Susan's food is gone as well.
 * In the memory of Stan that Dipper enters, when he first enters it Soos' T-shirt is the same color as his skin.
 * When Soos first comes into the shot of Bill disguised as Soos, Soos has six fingers on his left hand.
 * When the memory of the combination falls into the Bottomless Pit, initially Stan is not holding a cane. When it cuts back to him, he's holding a cane.
 * While watching the memory of Stan explaining why he is hard on Dipper, Dipper is hanging his hand onto the wall in the memory. In a later shot, Dipper has to push through an invisible wall to get into the memory.
 * When Bill is about to finish off Mabel and Soos, Mabel's skin, which was green in the previous shots, changes to her normal skin color.
 * In the memory the Stan and Lazy Susan on a date at the end of when Stan says, "Nonspecific excuse" Lazy Susans pupple dissapears for a frame.
 * When the twins and Soos enter Stan's mind, there are candles around him. When they leave, the candles and his fez are gone.

Gideon Rises

 * When Gideon jumps through the paper-covered hoop, he is wearing the Mystic Amulet that was destroyed in "The Hand That Rocks the Mabel." In the next shot he is wearing his normal white necktie.
 * When the kids, Stan, Soos, and Abuelita are first watching the news, Shandra Jimenez is talking about the Mystery Shack's new ownership. At first she isn't wearing a Gideon pin, but when she goes to interview Gideon, she is.
 * In the shot where Gideon unveils his Gideon Land model, his white tie breifly turns green. Later, it turns green again when he commands the gnomes to take Dipper and Mabel away.
 * The tattoos on the bouncer's arms disappear as he grabs Mabel.
 * When Wendy mounts her bike, the outline around Dipper's right eye is briefly miscolored.
 * At the exact moment when Gideon tells the gnomes to subdue the twins, his right foot is split in two.
 * In "Little Dipper," the maze page is the page before the height altering crystals one. In "Gideon Rises," the Gremloblin page is before it.
 * When Gideon asks Old Man McGucket if the Gideon-bot is completed he has 2 and 3. However, when he enters it, the books are gone. Later, when Dipper and Mabel defeat him, 3 is revealed in the robot, as Dipper found it in the rubble, and Gideon held 2 in his clothes.
 * In the photo in the newspaper article about Gideon's incarceration, Gideon has only four fingers on each hand.
 * When Dipper is first shown unpacking, the perspective of his suitcase is wrong and laid over partially on a boxes of crates in the background. In the next shot, it's correct.
 * When Mabel tells Dipper that he doesn't need the journal, there is a suitcase on her bed. In the next shot, it's gone.
 * After Soos squirts the twins with water guns, there is a pan-down from the attic to the Mystery Shack. However, the rooms are facing opposite directions.
 * At the end credits, the TRUST NO ONE page is on the wrong side of the book, as in "Tourist Trapped" it's on the left, not the right.