Continuity mistake: Right after Paul goes home with the doctor, the doctor and his wife are clearing the dinner table talking about Paul staying at the house. The wife turns to the dinner table and is holding 2 napkins. The camera angle changes and the wife is now seen walking 2 glasses over to the sink.
Continuity mistake: In the chase sequence where Paul Vitti and Dr. Ben Sobel are being chased in Sobel's Grand Cherokee, we see the car plow head-on through a bank's drive-thru ATM machine. Yet later on when we see a shot of the car's front grille again, and the car doesn't have any front end damage from the crash.
Continuity mistake: When Paul is brawling with the inmate in the Sing Sing canteen, there is food on his tray at first, but when he uses the tray as a weapon, there isn't even residue on it.
Continuity mistake: In the scene where Billy Crystal and Robert De Niro are eating at a Sushi Bar with a crew of people, Billy Crystal is acting up due to a reaction of medication and alcohol. Robert De Niro threatens Billy by telling him that he would stick a f***ing fork in his eye; when De Niro is waving the fork around you can plainly see a noodle on Billy Crystal's face, however, when the shot changes a second later, and shows Billy Crystal and Robert De Niro, there is nothing on Billy Crystal's face; the noodle has disappeared. (00:44:00)
Continuity mistake: Ben Sobel's beard is alternately short and bushy throughout the film.
Continuity mistake: When the armored car guards are climbing the wall to chase the truck, Vitti's men are shooting through the top of the wall. The bullet holes keep appearing and disappearing.
Continuity mistake: When Paul gets out and goes to meet his crew for the first time, as they're hugging him the guy in the blue hoodie hugs him twice.
Continuity mistake: When the mobster grabs Crystal by the balls, Crystal stretches his left arm. Shots alternate between front and back, and from the front the sleeve covers the wrist, but from the back the watch is visible.
Continuity mistake: When the cop is shown on the TV news breaking the van's rear glass to get the gold, the amount of glass left differs between shots.