Gravity Falls

The show uses backwards messages, riddles, and a variety of codes and cryptograms for viewers to crack in order to uncover secret messages. These messages can be found in plain sight at the end of the credits in every episode and hidden throughout the actual episodes. Sometimes the messages can be decoded into something comical, but other times it will be something more serious that will reveal hints and important clues for future episodes or even extra lore on the story and characters. According to Alex Hirsch, the codes for every episode are written out by him and inserted into the episode at the last minute.

Throughout the series, the Dinosaur Skull's (Probably a Tyrannosaurus skull) Fenestra (Hole in front of the eye hole) keeps changing shape along with its location on the skull.

There is a cryptogram during the credits of each episode.

Some foreign versions have the picture on Stan's fez removed. Cryptograms shown at the very end of the episode's credits may also be removed.

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