Continuity mistake: As Dalton stands inside the bank vault staring at the cash, the scene jumps from a wide, distant shot, to medium, to close-in, just outside the cage. Another robber stands just outside and between jumps his gun position shifts from relaxed to raised to relaxed again.
Plot hole: When Clive the mastermind blacks out the cameras, the detectives say later that there was a blackout period of only a couple of minutes with no footage of anyone entering or leaving. That means the from the footage just before the robbery you could ascertain who was in the bank and who are the robbers, or if nothing else narrow down the pool, simply by eliminating anyone in the bank already. (00:05:00 - 00:28:00)