I agree, the flats work in the backlot setting, but I think they could have been done SO much better. It looks like a high school theater production, and not a good one of those at that. They are too cartoon-y... to much like the opening credits of the movie. They should be more like the actual shots in the movie, especially for a ride that is going to TAKE you into Monstropolis. Given that fact, they shouldn't use doors at all on the exterior, but as has been mentioned, use the city skyline. But this is a nother topic for another thread.