Revealing mistake: Near the end when Ace gets into his Cadillac, in the first shot facing the front of the car, there is a protective glass in front of Ace (the same width as the windshield) with the dashboard in between that glass and the windshield. Note the vertical edge of the glass is visible at the right side, and the rearview mirror's sticker on the windshield casts a shadow onto the second glass. During the stunt, the flames on the dashboard are between the glass shield and the windshield, keeping the actor safe from harm. (02:46:05)
Continuity mistake: Towards the end of the movie, when they first kill Nicky's brother, Dominick, and they throw him in the pit, his full chest is covered in blood, but in the aerial shot it is clean with just the bloody face.
Visible crew/equipment: When Ginger obtains the deposit box's key after having rushed to Ace's house and goes to the bank to open the deposit box, a boom mic can be seen reflected on the bank's glass door.
Continuity mistake: It is daylight when the car of Ace Rothstein explodes. However, it is night when he is being placed in the ambulance.
Continuity mistake: When Nicky Santoro meets the men in the desert, first he is getting out of the car with one person, but then he is in the next shot getting out of the second car which just pulled up, and he is getting out of the car with Frank Marino.
Continuity mistake: About an hour and a half through the movie there is a scene with Nikki on a black and white TV. On the TV they are showing a photo taken by police of Nikki talking to another man holding a toothpick to his mouth to cover his lip from lip readers. That scene takes place later in the movie. The police have not yet taken that photo, we see it happen later on. (01:32:49)
Continuity mistake: When Sam is talking with Philip Greene after firing Ward, there is a shot of Sam facing the camera gesturing with his right hand not holding a cigarette, the a shot with his rear to the camera holding one, back to a shot facing the camera with empty hands again. (01:10:45)
Other mistake: When the man goes into the casino and takes a suitcase full of money to Kansas, he is parking in a supermarket. Later in the movie, after a plane lands on the golf course the same shot of the car in the supermarket is repeated. Check for the same parked cars: a blue VW beetle and a red car.
Continuity mistake: When Sam tells Nicky he's been banned in Las Vegas Sam holds a cigarette. His hand's position has no continuity between any shot.
Factual error: About a half hour into the movie, Nicky goes into the sports book to collect. There is a cigarette machine behind him and the price of a pack of cigarettes is marked $2.50 In the 70's a pack of cigarettes was more like one dollar. (00:33:04 - 00:33:35)
Suggested correction: Not only were vending machine prices for cigarettes higher to begin with, they simply jacked the prices up because they could. Think about how much a soda costs at a movie theater or airport.
I remember buying cigarettes out of a machine in the 80's - never needed more than 4 quarters.
There was a news report from 1988 still available online where a small pack of cigarettes from a vending machine was $3.50 (14 quarters). You must have found a super cheap machine selling very small packs and you weren't buying them in a betting parlor.
There is a huge difference between early 70's and 88.
That wasn't the point of my comment. Whoever said they never paid more than $1 in the 80's isn't remembering right or fibbing (which is why I didn't include it in my correction). The correction is still valid because the cigarettes weren't being sold in stores. Just like one time I had to paid almost $10 for a "$5 footlong" at an airport Subway or $3 for a vending machine soda at a theater when they were $1 at every other vending machine.
Character mistake: At their wedding reception when Ginger is talking to Lester on the phone he reminds her of when he watched her as a young "long legged colt." As a juvenile female horse she would have been a long legged filly.
Suggested correction: No mistake. Not many people know the terms of young and old animals. I myself don't often hear a juvenile horse called a filly, so I don't remember that when I see one.
Continuity mistake: After the very tense encounter between Ace and Nicky in the middle of the desert with De Niro watching Pesci leaving quickly, the distance between Ace and his car changes enormously in two different shots.