don't recall the number...i want to say 4. its the one with advertising for the Playstation Network on the billing.
ALSO there's a picture of Joel McHale (host of the show) by the corresponding auditorium door.
Yes, Its in the 4th theater which is on your left when your coming in the theater. It will have 2 Soup signs on each side of the door.
Enjoy the movie, its pretty funny.