Jessie's face, replaced with a penis in GTA V next gen.
The Mount Chilliad Drawing is an Easter egg implemented by Rockstar as a joke. In the Xbox 360 and PS3 versions of the game, the face of a man can be barely made out on the side of The mountain, however it was revealed this was a texture. In the Xbox One and PS4 versions of the game, the illusion is replaced with an actual drawing of a penis.
Trivia
- On an unspecified Reddit page, a few people believed that the drawing was a clue to the jetpack or (since there are the balls and the head) that it means Illuminati confirmed. These theories are "complete bollocks" and have been shrugged off by everyone.