Other mistake: During the fight later in the movie, when Batman stops Bane's henchmen from executing Blake, during a shot of Catwoman crouching, one of the henchmen behind her on the left of the screen just falls backwards, seemingly without being harmed in any way. If you look at the fight closely, it seems that it could have been intended for him to be the victim of an accidental gunshot to the leg that ended up not being followed through in post production.
Other mistake: After Batman returns to his cave, Alfred shows him the recording of the surveillance camera. From the angle of the surveillance camera, you can see that Bane shoots an armed guard that stands inside the metal detector. Yet in the original scene at the stock exchange there is no audible alarm from the metal detector that should've been triggered by the armed guard. In both recordings you can see that the green light ("ready" & "no alarm") is on all the time. (00:42:10 - 00:56:30)t-6