Other mistake: When Nitti (Billy Drago) kills Oscar in the elevator, not only is there not nearly enough time for him to write "Touchables" on the wall, but the writing looks like it was done with the aid of a ruler. If he had actually written it in the minute it took the elevator to reach the bottom floor, it would be smeared all over the place. (01:06:50)
Other mistake: When the agent is shot in the freight elevator he is shot point-blank in the head. However, when Ness finds him there's not a drop of blood on his clothing, or a hole in his head.