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Continuity mistake: Close to the end when Edward Norton runs up to the front of the empty building and Brad Pitt appears, he tries to break the glass door by pushing a bench into the door, but it doesn't work. He doesn't move the bench and he then shoots at the glass and breaks it. When it shows him walking through the broken door, the bench has disappeared. (02:05:10)
Answer: Most likely they either went back afterwards or chased the security guard off somehow. It's also possible with all their inside connections that they stole the body from police custody.
Greg Dwyer