I rewatched Episode 10, and I found something:
In the second shot (the first one showing inside the arcade), the top-hatted pyramid (from the one-frame journal page at the end of the intro) appears on the screen of the game on the right (the one with the garbage can next to it).
Also, another “Robbie is a zombie” hint: On the poster; Robbie’s band name is The Tombstones.
EDIT: Hey, new page! I never got the first post of a new page before.