gravity falls episode 1: the boy mabel is dating turns out to be a bunch of gnomes standing on top of each other's shoulders in a hoodie
gravity falls episode 31: the mystery shack turns out to be a front by grunkle stan for hiding a machine which can open a portal to infinite new worlds but may also trigger the apocalypse, leading them to be arrested by government agents. this can be unlocked with three journals that dipper found, which turn out to be written by grunkle stan's long lost twin brother, who was previously thought to have died in a car crash.
