Corrected entry: Near the beginning of the movie, when Phil (Bradley Cooper) goes with his friends on the roof of the hotel to search for their friend, he approaches the edge of the roof which is made of concrete. In the next scene, different angle shot, the same edge is a railing made of metal.
StGermain
23rd Jun 2011
Correction: Though it seems to be that way, in fact Phil steps on to the concrete ledge to get to the railing. Also Stu steps up to get to Phil in the same sequence.