Continuity mistake: In the scene where Neil is coming out of the elevator at the hotel Waingrow is staying at, you seem him switching his flashlight to his right hand while he reaches up with his left hand to set off the fire alarm. In the next shot, we see a close-up of his RIGHT hand setting off the fire alarm. The shot after this, you seem him lowering his LEFT hand from setting off that alarm, with the flashlight still being held in his right hand.
Continuity mistake: When the agents are doing surveillance on the hotel room, they have a camera connected to the "peep hole" on the adjacent door. There is a TV monitor that the agents are watching. When the agents open the door to leave the room, the door with the camera on it opens, but the picture on the monitor stays the same.
Continuity mistake: When Vincent is sitting at the table drinking whiskey and talking to Justine, the remote control, the bottle, the glass, the bottle cap, and the chicken leg all keep changing positions. Yes, he does pick up some of these items, but right after he drops the chicken leg to the table, the camera switches to Justine. 2 seconds later, it goes back on Vincent and all those items have moved at once.
Continuity mistake: Robert De Niro finds Val Kilmer in the apartment and they are discussing Kilmer packing it in. Kilmer is all stressed out, and decides to light a cigarette - using a Zippo lighter. The sequence of events is: Val Kilmer grabs a cig, smoke rises from the cigarette, THEN you hear the click of the Zippo lighter.
Continuity mistake: In the scene where Al Pacino is confronting Hank Azaria about his relationship with Ashley Judd, the position of the knot in his tie changes during the scene. (I saw this error noted under "corrections", but if you watch closely, the knot is almost completely under the left collar tab of his shirt between shots.)
Continuity mistake: When Neil sets off the fire alarm in Waingro's hotel, there is a little red sign above the fire alarm when shown from far away. When it shows his hand up close pulling the alarm, the red sign is gone.
Continuity mistake: In the shootout scene when they drive away in the car, De Niro is seen in slow motion as he realises there are cops in front of them as well as behind. He raises his weapon and fires, knocking the rear-view mirror off the window. In the shot directly after he is seen still firing his weapon and the mirror falls off the window again.
Continuity mistake: After De Niro beds the woman from the bookstore, he leaves to get her a glass of water. When he returns, there is a different cover on the bed than when he left.
Continuity mistake: While Chris is searching the armored car, Waingro stands there with his gun out. In the background, you can see the spike strip already pulled across the road . A few seconds later, they show the spike strip being pulled out across the road.
Continuity mistake: In the final airport chase, when Pacino and De Niro are at the end of the runway, an airplane lands. It is first filmed nose-on, then the shot switches immediately to a from-behind shot after the plane has passed overhead. The plane in the nose-on shot is a Boeing 747, evidenced by the "bulb" above the cockpit area. The plane in the from-behind shot is definitely NOT a 747 - no bulb.
Continuity mistake: After the first wave of police cars does the "demolition derby" across the spike strip, they show some cops running out to stop the next group of cars. When they do that, the spike strip is not in the street. Then the scene shifts to a close up of the cop cars skidding to a stop directly in front of the spike strip, which has now re-appeared.
Continuity mistake: When they torch the ambulance, you can see a dealership emblem that says "LEADER" right above the Chevrolet emblem on the back door of the ambulance. It is visible right after Chris puts the bomb in. In all other shots with the ambulance, this emblem isn't there. Obviously the "LEADER" ambulance is a "fake" that they used just to burn and destroy.
Continuity mistake: In the shoot-out after the bank heist, Vincent's rifle starts out as an AR-15 style with a carry-handle, but by the time he catches up to Mike, it switches types and has no carry-handle.
Continuity mistake: When the crew's black van is in front of IGM, Trejo turns the parking lights off and there's a shot of Neil coming out the door to hide in the corner. Then they switch to the police monitor where Vincent is watching Neil, and it shows the van's lights are still on.