Continuity mistake: In the scene where Sophie finds the cross key behind the painting, her hand is holding the painting while the key falls, but in the next shot, her hand isn't touching the painting at all.
Continuity mistake: When the killer (Jigsaw I suppose) is releasing Tom's children from being hung by their hands, right when they get down the rope holding them up disappears.
Revealing mistake: When Eric Matthews is smashing his foot, he hits it the first time and it shows a close up. If you watch the small amount of blood when he hits it again they have used the same shot. (00:04:00)
Revealing mistake: When the driver is taking Amanda to the airport at the end, all the dials on the car are at zero, so obviously the car is not moving at all.
Visible crew/equipment: When Lois pulls up to the house where the blackout was traced to, she hears some music coming from the boat down at the dock. As the camera pans upwards over the car, as she steps out, the whole camera and a crew member are reflected in the side of the car.
Other mistake: While the wizard is speaking near the portal, a ghost image of him appears to the left.
Continuity mistake: When Ashley moves in with her two friends she breaks their bathroom mirror with a hairdryer. Later on in the movie, in the scene where her two friends are giving her a pep talk about luck, we see the same bathroom mirror in the background, which is now perfectly fine. Right after that, Ashley goes into the bathroom and looks at herself in the mirror, which has suddenly gone back to being broken.
Continuity mistake: Mina Hoyt's bra strap before the vault was a white strap. After she completed the vault, the bra strap changed to hot pink. (01:19:05 - 01:20:00)
Revealing mistake: In the disco scene, the DJ is playing music, but the Pioneer decks and the DJ Mixer are not even turned on, as no lights are showing.
Continuity mistake: In the long crash scene at the end, the Perrier car loses the front passenger side tire in the initial flip, but in the next shot it is attached to the car again.
Factual error: Rescuer and US Marine Jason Thomas is an African-American in real life, but was portrayed in the film as a white man. The film's producers realized the mistake only after production began, and apologized to Thomas, whose identity had not been widely known for years after September 11th.
Factual error: In the beginning of the movie William supposedly boards the train in Lincoln, Nebraska. All the vehicles in the train are from Europe and never rolled in the United States. (00:03:35)
Continuity mistake: At the end, during the fighting in the Cathedral, the last woman left is getting first cut by Steven Seagal at the right breast. A moment later, her cut is on her left side. The next moment it is on the right side again.
Plot hole: Cutting plastic explosive and disguising it as chewing gum wouldn't hide the smell from bomb sniffing dogs.
Factual error: In a few scenes at the hotel by Heathrow Airport, several British Airways aircraft are seen, all with the current paint scheme instead of 1995's.
Audio problem: Just after the car crash, when the zombies are taking Starla, Bill and Kylie yell after her, but they call her Carla.
Continuity mistake: Right before battle, Nasuada is showing Eragon Saphira's dragon armor. The helmet is full face, with two little slits for eyes. When it shows Saphira wearing it, the helmet covers only the top part of her head and cuts off above her eyes. (01:20:35 - 01:22:30)
Deliberate mistake: In the parking lot at the horse track, the old cars are so huge, they don't fit properly in the tiny modern spaces. They are hanging over the backs of the spaces so badly that the drivers would only have about two feet to try and get their enormous cars out of the spaces.
Continuity mistake: In the scene where Larry's partner is writing on the white board, a line appears and disappears from the restaurant name Macelli's in the middle to the restaurant name Macelli's on the right side.
Factual error: As the two fast boats start heading up river towards the finale shootout, one boat has its navigation lights reversed. It has a red light on the starboard/right side, and a green light on the port/left side. It should be the other way around. (The lights on the other boat are correct.)