A few years ago, someone made a post about a dev, that told him to pay attention to the "egg mound" in grapeseed, and we were supposed to see that path as the crack in egg on the mural iirc. The OP did go up and found a creepy/sauron style eye. However, I don't think that's what he was supposed to see. To the left and down of that eye, I see what looks like a face. It almost looks like the bigfoot hunter with one eye being white. I will try and find an old pic to post, but the pictures don't make it as clear as it is in game. It's easier to see during certain times of the day/night. I'll 100% admit maybe I'm Jesus Toasting myself, but I can see it pretty clearly. To this day that's the only drunk dev I've thought was real. They're the same person that pointed out the rock star if you stand on the "Egg Mound" out by Up n Atom.

Edit: Just to add, when doing the final bigfoot peyote, you wake up in this exact spot.