If you have solved the cryptograms from Rumble's Revenge, you know that the second clue Bill gives is: "The handyman knows more than you think."
- Question is who is the handyman?
- Obviously, Soos.
I mean think about it. From the very first episode he has always belived Dipper's crazy ideas about monsters and other stuff. He also says that he thinks the mailman is a werewolf, and one of the pictures in the theme could be the mailman. He is also the one who "discovered" both the rooms with the wax figures and the electron carpet.
- Remember, Nothing in Gravity Falls is what it seems.