When Detective Knight jumps into the ambulance and struggles with Dezi for the gun, the camera mostly focuses on close-ups of Bruce Willis face. However, in the shot at circa 88 minutes when the gun is fired during struggle, Bruce Willis is quite obviously replaced by a stunt double who looks almost nothing like Willis. The stunt double is much younger, has different facial features, different skin complexion and thicker eyebrows, and is completely bald, whereas Willis has pattern baldness with a bit of hair remaining on the sides of head.
Obvious CGI rendering of Detective Knight when he jumps on back of the speeding ambulance.
The cinematographer's reflection can be seen in the door glass when the bank robbers enter the bank in the opening bank robbery sequence.