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.
Suggested correction: Whilst this is true, I don't think it is a continuity mistake. It looks to me like it is intended to suggest the passage of time between each of the three shots.
Revealing mistake: During the final conversation between Detective Frazier and Arthur Case, Frazier holds up his hand with the ring on his middle finger. It is pretty obvious that the hand was inserted into the scene in post production; the hand doesn't move in a natural way and simply looks out of place.
Suggested correction: Really? I don't see anything unnatural in the hand's movement at all. Doesn't look at all obvious to me that it was inserted in post-production. After all, Frazier refers to "this ring." They will want it in shot so I'm sure they made sure Washington held it in shot.
Yes, really. Look again. Look at how it moves down and vanishes out of the frame. No human hand moves like that! They didn't have Washington hold it up for the shot and it was inserted later as a pickup shot. See this IMDB goof entry for more details: "During the final conversation between Detective Frazier and Arthur Case..." "a picture of a hand with a ring on the middle finger was inserted into the scene - first moving up into the shot, and then moving down off screen."