Continuity mistake: When Cory is killed, Joe hears the sirens and puts his weapons up in the air. When the police cars come, Joe walks up to the car that parks directly behind Jimmy's Jaguar. In the shot behind Joe no policeman steps out when the cars drive up, yet, in the following shot a policeman is already standing beside the police car holding his weapon. (00:30:05)
Factual error: When the black car lands upside down in the pool, you can see that it lands as if it were dropped straight down. The car should have hit the pool at an angle, for it was speeding off a hilltop at a very high rate of speed when it entered the pool. (01:18:35)
Continuity mistake: When Wayans and Willis are chasing the limo on the freeway, Wayans draws a picture of a bomb to hold up to the guys in the limo. He draws a large circle with about 6 lines coming out of it with the word "BOM" underneath it. When he holds the picture up at the window, there is only 1 line radiating from the circle. (01:20:40)
Continuity mistake: When Joe and Milo are up on the steel structure where the stadium lights are, just before Joe throws the bag of ammo over the edge, a sniper runs to the right in the background, then in a following shot, the sniper runs to the right again. It is the same sniper. (01:31:15)
Revealing mistake: After Hollenbeck has been tasered and dragged unconscious to the bad guys car, they open the door to put him in and lift him. Hollenbeck uses his right leg to step forward.
Visible crew/equipment: Close to the end of the film when we see Joe in the woods with all the bad guys, he has his hand in the puppet that his daughter gave to him, now as the camera pans down from a wide shot, look to the right beyond the tree and there is a crewmember standing next to a red ladder, the shot is quick but very visible. (01:13:25)
Continuity mistake: Near the beginning of the film where we see Joe and his best friend Mike standing outside of Joe's house, if you look Joe is standing in front of the tree and his car is parked in line with the tree, yet when Mike walks away and Joe turns around, the car is now parked almost in front of the tree, and Joe is standing behind the tree. (00:16:35)
Continuity mistake: When Joe has been kidnapped, and then killed one of the bad guys, Milo says to Pablo, "Take the corpse out of here and fix Mr Hallenbeck a drink." Pablo is holding his gun in his right hand, but in the next wide shot Pablo is now holding his gun in his left hand. (01:03:10)
Continuity mistake: When Joe and Jimmy are walking down a tunnel going to Marcone's office, several players are running down the tunnel, and then you hear the voice of the big guy (Jimmy broke his nose in the pool scene). Lots of players are running down the tunnel, yet when the big guy grabs him all you see are the players in the distance, when we should see loads more players running past Jimmy, Joe and the big guy. (01:21:35)
Revealing mistake: This is when Joe finds out his wife is cheating on him and shoots their wedding photo. If the bullet hit the photo, where is the bullet hole? It shows that something other than a gun was used to destroy the frame in this shot. (00:16:40)
Continuity mistake: At the very end of the movie as Bruce Willis is talking to another character (I think its his wife I can't remember) the camera keeps switching between close-ups of Bruce Willis and the other character as each of them is speaking. Watch the cuts and bruises on Bruce Willis's face - each time the camera goes back to him the cuts and bruises very obviously change. They change between very severe damage to just slight scratches and light bruising.
Plot hole: When the police chief asks Joe 'where's the briefcase they were telling me about?' Joe tells him to look in the back seat of the white BMW. There are a couple of problems with this. First, the police chief is looking for a case with a bomb in it, because he received a phone call from the guy who had his BMW stolen. Even if he knew about the money, which is unlikely, the police chief has no way of knowing that the case he is about to open is not a bomb, since no-one saw Marcone steal the case with the bomb in it. Yet he opens it without calling the bomb squad. Second, Joe saw Jimmy put the case with the bomb in the back seat, so why doesn't he warn the police chief about it? (01:35:00)
Continuity mistake: At the police station, just after Cory was killed, the Chief of the precinct is looking at Joe and says "The same son of a b**ch saved the president's life." When the shot cuts to the other guy, then back to Joe and Jimmy outside the office, in the background the chief is now sitting back at his desk - some pretty quick moving between shots. (00:31:40)