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.