Continuity: When Mathew Perry goes to Chicago to meet with the head Boss, Bruce Willis' wife comes to talk with him at the hotel. In the scene where he is brushing his teeth he picks up the mouthwash bottle and swigs some, then sets the bottle down on the counter. The camera cuts back to her, then back to Matthew Perry, and the mouthwash is gone.

Visible crew/equipment: After Jimmy shoots the undercover cop Frankie carries him into the house and seems to drop him right on the floor, but if you rewind it slowly you can see a blue mat that he actually falls on.

Revealing: Oz's wife never smokes her cigarette. For instance, watching their new neighbour on the porch, she blows out no smoke, raised the cigarette to her mouth for a second and then does another fake, smokeless blow.

Continuity: When Bruce Willis first comes into contact with Michael Clark Duncan - in the hotel room MCD takes his sunglasses off but when he gives BW a hug they are on but when he steps back they are off again.

Continuity: In the scene where Cynthia agrees to marry Oz, you can see her hair change position in between the shots.

Continuity: When Oz's wife is having sex with her new contract killer you see his necklace. Its position changes between the shots.

Continuity: When the dead undercover cop is sitting in the dentist chair, Nick grabs his face and swings it around so they're facing each other. Look closely and watch the dead cop's eyes move as he focuses on Nick's face for a second.

Continuity: When Oz is back from Chicago, after taking Jill to meet Jimmy, Oz calls Jimmy's wife, and when the phone rings, a red light shines on the phone. Then on the 2nd call the light doesn't shine anymore.

Continuity: When Cynthia goes to the bank to claim the $10 million, her hairstyle with the two barrettes keeps changing throughout the scene.

Continuity: During the boat scene towards the end of the movie, depending on who is talking (Jimmy or Oz), the sun is out when one of them is being filmed, then it is cloudy when the other one is filmed. This happens throughout the entire scene.

Factual error: It's impossible to receive a phone call on a Bell Canada public phone, as Jill did.

Continuity: When Matthew Perry is drinking with Willis' wife in the Chicago hotel room, the level in her glass changes - one minute there's not much in there, then it's half full, and then she swigs back the last drop!

Continuity: When Oz gets to the dentist's office the undercover cop lies dead in the chair facing straight left. In the next shot his head has turned.

Continuity: When Nick is having lunch with Jill (the assistant) the waitress takes his menu twice. Once while the camera is on Nick and once while the camera is on the waitress. The hand she's holding the menu in also changes from left to right.

Continuity: When Oz gets to Jimmy's house, you see Jill holding a gun at chest level and Jimmy pointing a gun her direction. When it cuts, Jill holds the gun at shoulder level and Jimmy's gun is lowered.

Revealing: When one of the civil cops knocks at Jimmy's door it is obvious that someone behind it (from the movie crew) opens it. He doesn't knock hard enough to make the door slide open by itself.

Continuity: The undercover cop got hit at least five times in the chest in the shootout scene, yet there is not a single drop of blood on his white shirt when his body is laid down on the dentist chair.

Continuity: Jimmy's necklace change from being under his shirt to being on top of it between shots.

Other: When they've duct taped the cop to the x-ray machine to check the outcome of the procedures Oz did on his teeth, there is no film in his mouth as the machine takes the x-ray.

Continuity: When the bad guys get to Jimmy's house one of them tries to open the door wearing black gloves. In the next shot you see him trying to pick the door with white doctor gloves. Why did he change?