Continuity mistake: In the scene where Madeleine's aunt puts the phot of Madeleine and Freddie in the book, she puts it in so that it cannot really be seen when the book is shut and it is facing backwards. When Madeleine picks up the book, it is facing the other way and is half way out of the book.
Continuity mistake: When Lilliana is running from Gustav in the woods, you see a lot of leaves in her hair. When she falls to the ground, all the leaves are gone.
Continuity mistake: When Joy is packing up to leave for eastern Europe, she's talking to her mom and she has two trolls in her hand, and you can see that the troll with the blue hair is still on the stand. In the next shot, she has the troll with the blue hair in her hand.
Continuity mistake: Costume continuity throughout the whole film. When the female scientist gets changed into khaki pants they are tight fitting, they alternate between tight and baggy throughout.
Continuity mistake: When Mr. Eddie goes back to his Mercedes after beating up the "tailgate guy", the left side of the bumper on the Mercedes is damaged. When they drive back into the garage, we see the left side of the bumper is fine.
Continuity mistake: In the scene where Chyna decides she needs to fall down the stairs to break the chair she's chained to she's supposed to be handcuffed. As she starts to fall and tumbles down her hands are not handcuffed and fling around wildly.
Continuity mistake: When Wynn is talking to Al about the mission to blow up the plant, Wynn puts his cigarette out in the ash tray in the scorpion bowl and there are 4 butts in the ash tray, but a minute later when the camera shows the 2 scorpions fighting, the ash tray has no cigarette butts in it. (00:11:19)
Continuity mistake: In the middle of the hotel fight when Toby and Deliverance go through the door in their hotel room you see the door open and a number of shots impact it. The characters then go through the second of the double doors. This is commented on in the DVD commentary. Not only do the bullets not go through the second door, they don't go through the first. On top of that, you see a shot with the two doors opened, but when the bad guys enter the room the double doors miraculously turn into just one! This layout is then used for the rest of the scene.
Continuity mistake: Right after Wendy is told to stop praying during the Hoods' Thanksgiving dinner, Elena picks up a plate of beets and serves herself one. Ben passes the rolls to Paul at which point Elena repeats the same thing (her plate is empty again). (00:45:10)
Continuity mistake: During the gun battle Kiefer's car gets shot up by the police but during the entire drive afterwards, the car shows no damage.
Continuity mistake: Throughout the entire movie the size of the Event Horizon's interior versus that of its exterior is repeatedly off. Evidence of this is seen mostly with scenes that take place in the main access corridor. First off, it is made to seem that the ship has one central connecting tube, but in the exterior shots there are several tubes that make up the middle of the ship. This is pointed out when Miller is making his way across the ship to get to the air lock that Justin is about to open. Second, the length of the tube (heck even the whole ship) is too small in relation to how the ship appears from the outside. This is pointed out in a few different places in the movie - when the crew is up on bridge, then race all the way to the airlock in the middle of the main access corridor, where Justin has just closed the inner door and when the doctor is asked to go grab his med kit from medical, which is across the ship and he is gone only a few seconds, and also when Miller is running though the corridor to activate the explosive charges. Since the ship has no faster means of transportation, such as turbolifts or a tram system, they could not be covering the distance they appear to be covering in the movie.
Continuity mistake: When Dante is lying back in the bathtub, watch as the pillow behind his head keeps disappearing and reappearing in the shot.
Continuity mistake: When Joe and Gus enter the diner towards the start of the film we see the waitress come over to see if they are ready to order. The camera switches from looking at Gus and then to Joe. When the camera is on Joe, we see the guy sitting with his back to Joe turns his head round to the left to look at Joe and Gus. Then when the camera changes angle to look at Gus and Joe from in front of this guy, his head is twisting back round from the other direction (right to left).
Continuity mistake: At one point near the beginning when they're collecting the crew, Robert Carlyle is in the car smoking. He lifts the cigarette to his face and he's not wearing a glove. In the next shot he smokes again and he's wearing gloves.
Continuity mistake: In the scene where Dunn is collecting gear from the surplus store. The cops show up. When it shows a close-up of the cops in front of the cruiser the wipers are on, but then it goes to a distant shot and they're not on.
Continuity mistake: When Richard Gere's attorney tries to get into the murder scene apartment, the guard says to her (in subtitles) "if you mess up the murder scence [sic] you will be in some trouble". There is a typo in the subtitles.
Continuity mistake: In the scene with the electric shock treatment, Dr Yealland's shirt switches from army khaki to a purplish colour and back again several times.
Continuity mistake: In the final scene, when Parker Posey shoots her brother, just before they act out their JFK shooting re-enactment her shirt is unbuttoned and she begins to button it. A couple of minutes later, when she's holding the gun, her shirt is unbuttoned again.
Continuity mistake: In the last scene, Max's bathing suit changes color, from dark blue to light tan, back to dark blue.
Continuity mistake: In the scene where the postman gallops by the country house full blast and then comes back to pick up the letter from the boy's hand, you hear hoof sounds for long enough to take him hundreds of metres away, while the camera is on the boy. But when he is actually shown stopping to turn his horse around he has only come as far as the corner of the premises, maybe 20 meters away. (01:53:05 - 01:54:05)