Continuity: When Oz realises that Jimmy "The Tulip" Tudeski is his neighbour, we see a few newspapers flying up on the screen, on the second newspaper the article with the title "His "Two Lips" are Sealed", the article text does not match the headline.

Continuity: When Nick and Jill are eating at the outdoor cafe the bottle of Pepsi turns around from shot to shot. When the camera focuses on Nick, you can read the whole word "Pepsi" but when it's on Jill you can still read half of the same word even though she's on the complete opposite side of the table.

Factual error: When Sophie is driving Oz to the airport, the airport sign indicates Dorval underneath. While Dorval is a real airport, the airport seen in the movie is at Mirabel, which is about 45 minutes north of Montreal and has been closed to international and domestic travel for several years.

Continuity: When Oz is telling Jimmy about his father in law's loan you can see a man standing beside him turning his head to the left. When it cuts to a closeup the man is looking forward.

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

Continuity: When Oz and Jimmy are talking on the Royal Mount, there's a florist stall, with a panel written "fleuristerie". Some shots later, it is bigger with "floreteria" or something like that written on it.

Continuity: Sometime during Matthew Perry and Bruce Willis's first meeting outside Bruce's house, Perry tells him how familiar his face is. During one of the questions, the shades Bruce hung on his shirt disappear in one shot and reappear in the next.

Continuity: When Matthew Perry is talking to Bruce Willis after their drive and he's sitting on the ledge, when he says "no, I live here with my wife" his hands are either side of him on the ledge or together in his lap, depending on the angle.

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.

Continuity: When Cynthia and Jill discuss the money in the bank they are both in the visible shot. In the next shot Cynthia is gone.

Continuity: When the undercover cop finds the tape recorder in the car he uses a white handkerchief in his left hand. In the next shot suddenly a handkerchief in his right hand appears.

Continuity: In the scene where Gogolak has been shot in his neck, a fly appears out of nowhere in the middle of the screen.

Audio problem: When Oz and Gogolak gets into the car Gogolak puts a cigarette in his mouth, at the same time he says "You know, I got the same car". His lips aren't moving and he is lighting his cigarette.

Deliberate "mistake": Jimmy catches a fly in the air and puts it in his mouth. He then spits it out with great power. You then hear a "Bzzzzz." assuredly made by the fly. How can a fly flap its wings when spit out in that velocity?

Deliberate "mistake": When Oz lies in the dentist chair he has an mouthpiece (connected with anesthetic) lying on his forehead. When he gets up the mouthpiece falls of his head with a great "POP". This sound would only occur if there were vacuum, which there weren't.

Deliberate "mistake": When Oz gets back to the hotel after visiting Gogolak he orders a bottle of scotch via the phone in his room. He then gets a visit by Jimmy's wife. Then roomservice get there with the scotch and two glasses. How would roomservice know there would be two persons when the room was booked for one person (Oz) only?

Revealing: When Jill and Cynthia meet by the water towards the end, Jill produces her gun and is told to throw it in. As she's holding it you can see the base of the grip and there's no magazine in it - hardly the most effective weapon...

Continuity: After Cynthia tells Jill she loves Oz in the bank, we see a long shot of the boat and Jimmy has his hand to his ear, looking like he's holding a phone. We then hear a phone ring, cut to a closeup of Jimmy with his hands by his side, and he lifts the phone to speak.

Audio problem: As Yanni is getting off the plane there is the sound of the plane's engines slowing to a stop but the engine is not turning at all.

Continuity: When Oz and Frankie gets in to the hotel room where Jimmy is waiting for them, Oz bumps into Frankie and knocks over a lamp. He gets up holding the lamp in front of him. The way he holds it changes during the shots, and the lamp shade changes position.