List of allusions/Multiple episodes

Multiple episodes

 * Characters frequently drink "Pitt" cola. Given the similarity in the name and color of the can, this is a reference to Mr. Pibb soda. It was also likely named after Joe Pitt, one of the directors of the series.
 * Lazy Susan's name is a reference to the spinning table.
 * Characters sometimes use a Tapeman, an allusion to the Walkman

Opening

 * When Dipper is exploring the cave, there are characters that look like runes. However, one of them does not match a known rune and the others do not translate into anything intelligible in English.
 * Mabel and Dipper walk past a taxidermy Jackalope in one scene.
 * For one frame, an image of Bigfoot flashes in the same pose as the alleged Bigfoot in the Patterson-Gimlin film.
 * Among the Polaroids are photos of Jackalopes, a Fiji mermaid, flying saucers, and the tabloid character Bat Boy.
 * Bill Cipher is a reference to the Eye of Providence.
 * In the ending, a photo with the logo on it is shown, and if one looks at the top right corner, two flying saucers can be seen in the same position as the two saucers over the Eiffel Tower in Paris in a famous fake photo.
 * The Konami Code is also visible.
 * A statue of Paul Bunyan appears in the first few seconds of the theme song. The most famous Paul Bunyan statue is in Portland, Oregon.
 * In the animatic version of the theme song, Mabel and Dipper arrive on a "Fast Dog" bus. This is an allusion to Greyhound Lines buses.
 * In the released version, it has changed to "Speedy Beaver." It may still be an allusion to the Greyhound Lines buses, though.