@Ghostmusicalfan: Yes, I know there is a lot more of the set involved! The poster and the way Sam walks to the door! But if you look closely at the door you can figure out one part and then observe the rest!
@mrtheatre123: Just keep your eyes on the door and watch closely! You'll see! (And compare the scene to the can in the subway. It's done similarly... )
@Vicky: The letter gets me every time too! I have absolutely no idea how they do that. When I saw it in NY it didn't work one time but even then you couldn't see what was wrong or how it could work! -.-
Well we got to the booth one hour before opening time. The queue was pretty long already but once it started moving it didn't take too long... I don't remember how long it took us exactly but I guess it was about 30 minutes to get to the ticket window.