Other mistake: During the bathroom shootout scene, the terrorist shoots the bathroom stall walls from a heavy angle. When the walls and doors are shown from the front while being opened, the bullet holes go directly through both walls of the doors, which would only look like that if they were shot from directly in front.
Continuity mistake: When Jamie Lee Curtis and Tia Carrere are fighting in the limo, their hands can be seen wrestling for the gun on the roof in one quick shot before that action actually happens.
Continuity mistake: When Tom Arnold introduces Arnold Schwarzenegger to the remote camera eyeglasses, Arnold sees his daughter stealing money from his jacket. In two camera cuts, the angle and width of the remote camera view changes, although the remote camera is stationary on the fireplace mantle.
Revealing mistake: While the credits roll, Harry enters the Swiss mansion, the camera turns to a green-coloured night-vision filter and one can notice that the man entering the house is Harry's stunt double.
Revealing mistake: When Arnold horseback rides towards the hotel, Tom Arnold's van skids and you can see that he is a stuntman with a very cheap latex mask to resemble Tom.
Continuity mistake: When Harry gets in the Harrier, the aircraft's left forward nozzle is directed aft. In the next shot, the right forward nozzle is aimed down. The nozzles cannot be aimed in different directions. Additionally, the nozzles are aimed aft and down in subsequent shots of the same scene.
Continuity mistake: When Helen is on the couch with Simon, objects on the tables move around. Most notably, the books on the end table change position as well as which one is on top when the spies break in.
Continuity mistake: When Salim Abu Aziz slides through the intersection on the motorcycle, as he's being boxed in and before going into the hotel, the stopped cars change between shots. You see him stop near a white car with round, pop-up headlights, then in the next shot it's a different white car with inset square headlights. Then back to the first white car.
Continuity mistake: In the first scene in the Omega Sector debriefing room, after Francis leaves, the people in the background change too quickly between shots. Most noticeable, the man standing next the seated woman at the computer is gone and a woman from nowhere is in his place.
Continuity mistake: In the scene where Harry discovers Helen is having an affair and he's walking across the road. Between the wide and close up shots his wedding ring appears in the close up shots and disappears in the wide shots.
Continuity mistake: When Simon pees himself, Albert's hat keeps changing the way it's tucked on his head in every single angle until he gets to the van. Watch for the right side of his temple and cheek. (01:14:25)
Continuity mistake: Harry leaves the pack of cigarettes 15 cm away from the sink, in the close-up it's right next to it. (00:29:40)
Continuity mistake: When Harry dances the Tango with Juno there's a wide shot of the place, in the immediate close-up two guards appear out of nowhere behind Harry.
Continuity mistake: The position of the champagne bottle holder and the next chair changes between shots. When Michelle enters the room and the camera is placed in the bedroom, the bottle holder stands between (and somewhat behind) the chair and the window wall. When Michelle approaches the table (camera is now Michelle) the chair is between the bottle holder and the window wall. Later, at the end of the scene this changes again, depending on where the camera is. (01:19:50)
Plot hole: Harry goes into the Mall, and two of the terrorists follow him through the Mall, up the escalator, down the hall, and into the men's room. Then the third terrorist leaves the car and follows exactly the same path to where the other 3 went, even though there's no way he could have known exactly where to go.
Revealing mistake: When Harry confesses to Helen that he's a spy she punches him and knocks him down. When he falls one can notice it's Arnie's stunt double.
Continuity mistake: After Juno Skinner has killed her limo driver, the limo speeds out of control. There are two champagne glasses in the cup holders next to Juno, but both glasses disappear and reappear between shots while Juno and Helen are fighting each other. With the limo speeding across the bridge, it doesn't make sense that Juno's gun stays on the roof for a while. The gun should have slid off the roof when the limo banged into the guard rails. It doesn't fall off until after the limo has passed through the flaming truck wreck.
Continuity mistake: During the scene when Arnold is taking off in the harrier jet, the pilots hide behind a squad car. One pilot is holding his sunglasses. It switches angles and he no longer has sunglasses on. Then his hand moves and they appear as if they had fallen off and he was grabbing them. A few frames later they disappear again. If you look closely, it was obvious they were CGI'd in during editing.
Continuity mistake: When Harry, Helen and Juno are in the private jet, the amount of lipstick smear on his face changes between shots.
Continuity mistake: After the Swiss scene, Harry, Albert and Faisil are in the office. Albert talks about the Chinese woman and the dozens screens behind are broadcasting news reports. When they walk away, a mere frame later, the images on the screens surrounding are completely different, now broadcasting satellite images and computer texts. (00:21:35)
