Instead of a poster maybe a ticket booth and then the hidden movie theater :)
A hidden message in movie "Toy story"
Netflix Has A Ton Of Secret Movie Categories And Here’s How To Access Them
Home Theater Control panel hidden w/movie poster
Luigi the yellow car from cars is seen going past in the end of finding nemo when the fish get out side into the ocean!
I've seen some of these secrets before, but not the Boo one. How did I not recognize that Boo was in Toy Story 3 just a little older and straight hair?
Disney Movies Hidden in Other Disney Movies http://geekxgirls.com/article.php?ID=3576
13 Hidden Mickeys In Your Favorite Disney Movies…
Effects of pausing a disney movie