Gravity Falls - Easter Eggs & Hidden Details

Creator Alex Hirsch is good friends with 'Rick and Morty' co-creator Justin Roiland. In one episode of 'Rick and Morty', a pen, a notepad, and a mug from Grunkle Stan's desk fly out of a portal. Conversely, an image of Bill Cipher can be seen on a monitor in a 'Rick and Morty' episode. These references are fun nods between two creators who were working on their respective shows around the same time.

The time traveler from the future, Blendin Blandin, can be spotted in the background of several episodes before he is formally introduced in Season 1's "The Time Traveler's Pig." He can be seen in the very first episode hiding in the bushes, hinting at the show's intricate planning and timeline from the beginning.

In the episode "The Legend of the Gobblewonker," a figure resembling the popular internet creepypasta character Slenderman can be briefly seen in the background, adding to the show's mysterious and sometimes spooky atmosphere.

The letter 'H' is hidden in numerous backgrounds throughout the series, particularly within the Mystery Shack. This is a simple visual signature for the show's creator, Alex Hirsch.