Corrected entry: When Henry is being followed by the helicopter, he almost slams into another car. Henry's car has a brake light in the back window, but they didn't start that until the mid 80's at the earliest.
Corrected entry: In the scene where the guys go to Florida to "feed the guy to the lions," the lion first shown is a male with a huge mane. When seen upside down the 1st time it's the male, but the second time it's a female, no mane, slightly smaller, lion. They never show more than 1 lion in the pen, either.
Corrected entry: The scene where Karen pulls a gun on Henry uses two different guns, one blue and one nickel between the various camera shots.
Corrected entry: In the scene where Jimmy and Henry are leaving a diner after Morrie got whacked, Henry asks Jimmy "Well, what the f%&. do you want me to tell Belle?" (referring to Morrie's disappearance). Jimmy says "Who gives a f%&. Tom? Tell her he ran off with some broad. What do you care about her?" Jimmy calls Henry "Tom", then seems to look off screen right. It's as if he realized his mistake and was looking for Marty Scorsese to say "CUT"
Corrected entry: When Tommy blows away Stacks, he's got a silencer on the gun. However, when they show the scene in slo-mo, there's a huge bang every time Tommy shoots.
Corrected entry: In the scene where Maury is killed by Tommy, after Tommy tells Frank to chop him up, Frank gets out the car, and the light comes on, then we see Maury blink even though he's supposed to be dead.
Corrected entry: In the scene where Jimmy and Henry try to strangle Maury with the telephone, the phone cord is ripped out to be used as strangling material, but as this is taking place, the telephone rings.
Corrected entry: Although they are not really mistakes, these glitches were allowed to be put in the film: When Henry takes Karen on their first date to the club, he pays the door man at the side entrance at the club to let him in. If you look closely, the door man has to reach twice to take the cash from Henry. Then, when they are walking through the kitchen, Henry walks into one of the counters and bangs his hip.
Corrected entry: During the scene where the crew is having a barbeque and Henry is describing how they were like cops for bad guys, the camera keeps going back and forth to Paulie eating a sandwich. The first two times he has no napkin anywhere in sight, the last shot of him one appears neatly tucked into his shirt, like a bib.
Corrected entry: When Jimmy is in the bar with Henry asking to go for a walk, he has a very distinctive tie on. Once outside, Jimmy asks Henry if "Morey tell his wife everything". Although they have just walked outside, Jimmy has a different tie on.
Corrected entry: When Henry throws Karen off the bed after she has pointed the gun at him and he points the gun at her in one shot she has both shoes on and in the other the foot nearest the camera has no shoe then again in a split second the foot has a shoe.
Corrected entry: When Pauly and Jimmy go to meet Henry at Janice's apartment (his mistress), Henry offers them a drink which they refuse. This is a good thing considering that the Crown Royal bottle that can clearly be seen on a table behind Pauly's head is empty. The glasses around the empty bottle suggest that the table is used as a mini bar.
Corrected entry: When Henry picks Karen up for their first date, he is dressed in a grey and black checked jacket and she is wearing a summer dress. When they arrive at the nightclub, she is dressed in a black evening dress and he is in a dark suit.
Corrected entry: After Henry gets out of prison and goes to Paulie's house for dinner, Paulie says, "I bet you never ate this good in prison?" Only a few scenes earlier, there's a prolonged scene of all the great food "wise guys" eat in jail. Both Paulie AND Henry are in that scene.
Corrected entry: When Karen is sitting on Henry's chest, confronting him about his girlfriend Janice, with a gun in his face, you can look in the cylinder of the .38 in every shot that looks down the barrel and see that the cylinder is empty. The gun is not loaded.
Corrected entry: When Tommy shoots Stacks, in the first viewing he holds the gun close to the back of Stacks' head. In the slow-mo replay, Tommy is shooting from so far away that Stacks isn't even in shot.
Corrected entry: Billy Batts gets whacked in June, 1970. He is then driven away and buried upstate. Yet when Jimmy Conway tells Tommy and Henry - six months later - that they have to dig up his body because they are set to build in this spot they are all wearing short-sleeved shirts. Six months later? That would make it December. It's doubtful anyone would be digging up a body in upstate New York in December with short sleeves on.
Corrected entry: When Tommy goes to Kill "Stacks" in his apartment (Samuel Jackson), count the shots that are used to kill him. Now compare that number to the amount of shots fired when they replay the scene in slow motion...you will notice they are different.
Corrected entry: When the henchmen start being killed off, the one who is found in the meat freezer hanging from a meat hook can be seen to be breathing slightly.
Corrected entry: When Karen is sitting on top of Henry in the bed with a gun pointed to his face, the gun keeps changing colors. One second it's silver, the next it's black.
Corrected entry: When Tommy and Henry hijack a truck and Tommy asks to ride shotgun, he fires his revolver in the air 7 times through a paper bag. The revolver only holds 6 shots.
Corrected entry: At the beginning of the movie they pull to the side of the road and stab and shoot the not yet dead man in the trunk. In this scene Jimmy shoots him 4 times. Later, when they get to this scene in the story and show it again in slow mo, Jimmy fires the gun 6 times.
Corrected entry: When Spider insults Tommy he suddenly draws his gun and kills him, and the other people at the table quickly take cover from the gunfire. However, if you watch the other actors at the table, they all begin ducking out of the way before he even takes his gun out.
Corrected entry: There is a scene when Samuel L Jackson is killed in his bedroom. He's not wearing trousers, but after the murder there is a shot of him lying on the floor with trousers on.
Corrected entry: When Karen goes to confront Janice about her affair with Henry, she pages Janice through the building intercom. Janice is seen crying on her couch and trying to cover her ears from the sound of Karen screaming at her. It is impossible for her to hear everything Karen is saying because she is not holding the "Listen" button on the intercom. All she would here is a buzzing sound.