Corrected entry: After the scene in the park with the jugs, McClane and Zeus climb over the fence. If you look at the fence you can see that the part of the fence they climb over has an extra bar on top to make it easier to climb over for the actors.
Lightrock
28th Aug 2009
Correction: There is no "extra" bar. This is just how the fence is designed. The whole fence is that way, not just one section.
Bishop73