Revealing mistake: At the beginning of the film where Robert De Niro gets into his car and it explodes, you can clearly see the cut where they have replaced him with a dummy.
Revealing mistake: When Sharon Stone gets thrown out of Joe Pesci's club, you can clearly see the pads on Stone's hand's to break the impact of the fall.
Continuity mistake: When Joe Pesci is beaten and then buried - look at the blood on his chest. In one shot it is all over - the next it is just a smaller patch.
Revealing mistake: In the scene where Joe Pesci is beaten in the corn fields, if you look closely at the bats you will see them bend ridiculously on impact with his body. Foam bats anyone?
Continuity mistake: When Remo Gaggi is talking to Andy Stone about Ace cussing out the Board, there's a pack of cigarettes beside Gaggi in his car. The camera angle changes to show Stone's face, who is outside the car, and when it flips back to Gaggi, there is a Zippo lighter in place of the cigarettes. The camera goes back to Stone, and when it comes back again, the Zippo is gone and the cigarettes are back. And to top it all off, not once did Remo smoke in this scene.
Visible crew/equipment: When Robert De Niro goes to meet Joe Pesci in the desert, the whole crew is reflected on the side of the car.
Continuity mistake: Sharon Stone repeatedly smashes her car into De Niro's in the driveway, yet if you look closely in the shots as she gets out of the car, there is no damage to the front of her car, not even a broken headlight or glass on the driveway.
Continuity mistake: When Joe Pesci is stabbing the guy with a pen that insulted Ace, the pen is shown without blood after there was significant blood on it the cut before, then it goes back to having blood on it.
Audio problem: After Pesci and De Niro's meeting in the desert, Pesci gets into his car and you distinctly hear the sound of tyres peeling out. Am I wrong or is this impossible on sand?
Audio problem: In the scene where Sharon Stone is talking to Joe Pesci about how De Niro had his guys beat up James Woods, at one point Sharon Stone says, "Oh C'mon." If you look closely her mouth doesn't move at all. Also if you listen closely, that line comes out on surround sound. When she continues her line it comes out on mono. It was obviously recorded.
Continuity mistake: When Artie Viscano is complaining to his brother in law about Las Vegas, he backs into about 10 bottles. They all fall except for two, and then the scene cuts to to his brother in law and when the scene cuts back to Viscano, all the bottles are back up.
Continuity mistake: When Joe Pesci and his brother are beaten at the end, Dominick is thrown in the pit and facing one direction, after Joe Pesci is beaten and thrown on top, Dominick is facing the opposite direction than he was originally.
Visible crew/equipment: In the scene where DeNiro is throwing Sharon Stone's character out of the house after overhearing her on the telephone, he drags her into the bedroom. Just before the scene cuts away, the camera appears in the mirror on the wall behind them.
Factual error: In the jewelry robbery montage, Joe Pesci is shown holding a rechargeable Mag-Lite flashlight which would not have been available at that time.
Continuity mistake: When Nicky has the guy's head in a vise, after it squirts Nicky's hair changes between shots, from neat to messed up.
Other mistake: In the scene after De Niro's car explodes, they show him being put in the ambulance feet first. Patients are always put in head first.
Factual error: When Joe Pesci is driving to meet De Niro, he has to change cars. The scene right before going to the garage, they show Pesci's car driving around a corner and at the bottom right of the screen, you see a lamp post with a bus sign on it that reads CAT. CAT (Citizen's Area Transit) wasn't established in Las Vegas until late 80's early 90's. Before that it was the Las Vegas Transit. This scene was supposed to be late 70's, early 80's...
Revealing mistake: In the scene where Pesci's character is being buried alive, the body is quite obviously a fake: look at the mechanical way the head moves, and the movement of the chest intended to simulate breathing, not very convincingly.
Audio problem: When Nicky is at the airport having his suitcase searched by Customs, he says "If you find any cash in there we'll whack it up with ya" but his lips don't move in unison with the sentence.
Audio problem: When Pat Webb is reading aloud the newspaper article about Sam Rothstein, his lips don't match when he begins the sentence reading "the Midwest bookmaker", and also the audio sounds spliced in.
Continuity mistake: In the scene towards the end when De Niro's car explodes, one shot he opens the door and the window is up. In the next scene he opens the door and the window is down.