Visible crew/equipment: James Marsden and Cameron Diaz are getting ready to go to bed. They have a short conversation about turning off the Christmas tree lights. As Marsden is bending over to turn the lights out, there is a window behind him. As soon as the lights go out, you see a head start to pop up in the window. You only see the forehead of the person, then the scene changes quickly.
Continuity mistake: When the car hits a rock in the start, the are leaking oil, after 1/2 minutes they walk back to the spot where they hit the rock, the oil trail is gone.
Continuity mistake: After Megan dies, for real, Jessica tells the others that they loved Megan and Megan loved them. Her robe opens and closes between alternate shots.
Continuity mistake: A spirit knocks Christine over and gives her a bloody lip. Her boyfriend tends to her lip, which is very swollen. As she sleeps, there is a close up of a fly going into her mouth between her lips that are not swollen at all. After she swallows the fly, she sits up and her bottom lip is swollen again. (00:37:05)
Continuity mistake: During the shoot-out at the Guggenheim, each of the assailants is using so many bullets that they would have needed huge bags to carry all the magazines.
Continuity mistake: While Sam is talking to Trudy in the bank about the burned church, the name tag on the door in the background when the camera is focused on Trudy is there, then it isn't, then it reappears again throughout the scene. (00:35:30 - 00:36:00)
Visible crew/equipment: In one shot at the end, when all the surrogates fall to the ground, you can see a few crew members (one with a white megaphone) standing in the street in the upper left corner. (01:19:55)
Audio problem: At the end of the movie, when Cassie says, "This case is the key to bringing down Division", her mouth doesn't move at all.
Continuity mistake: 21 minutes and 30 seconds into the film, Dorian enters Cibyl's dressing room holding his hat and what seems to be the program to the performance (that he has just watched with Cibyl in it). A few seconds later, Dorian has only his hat. Seconds later, he has the piece of paper and his hat in his hand again. Dorian did not sit down anywhere or go near anything that he could have put the "program" down on to be picked up again a few seconds later. (00:21:30 - 00:22:00)
Revealing mistake: When Vang and Chev are running and about to jump the fence into the power station, look in the fence and you can see the handy foot holds that the actors use to go over the fence.
Continuity mistake: At the start of the movie Dylan Walsh cuts himself shaving and patches it with a piece of tissue, on the side of his jaw. Moments later as he's walking through the house the cut has moved to the corner of his mouth. (00:01:40 - 00:03:35)
Continuity mistake: Vic is consoling Danny, with his hand round his neck. Towards the end of the scene his hand suddenly jumps to Danny's shoulder.
Continuity mistake: Somewhere during the car chase scene, one of the rear lights of the delivery van breaks. After that it magically fixes itself in some shots.
Factual error: Despite the film building to a climax during a total solar eclipse, which requires a New Moon, the film constantly shows a Full Moon, which never changes phase over the weeks the film takes place.
Continuity mistake: Throughout the scene where the SUV crashes in the woods, Sadie is wearing large dangling earrings. In one quick shot where she is seen sitting in the back of the vehicle after the crash, her left earring is missing. It reappears in the next shot.
Factual error: During one of Blomkvist's flashbacks to his childhood with his babysitter (about 40 years ago), he is wearing Lightning McQueen shoes.
Other mistake: As Viggo Mortensen narrates, it's been years since every crop and animal has died. Trees have been dead so long they're rotting where they stand and falling over with a stiff wind or slight tremor. Yet, in the woods, there are always fallen leaves on the ground which ought to have long ago decomposed, rain or no rain. Obviously, they can't sweep out the whole forest to make a movie.
Continuity mistake: In the beginning during the cheerleader show the cheerleader to the right of Jennifer have her left leg stretched right, covering her right knee which is also somewhat turned right, in the next shoot, supposed to be just a change of the point of view, the same cheerleader have her left leg now straight to the left.
Factual error: The license plate on the sheriff's car when he arrives at the factory is 5Q49926. In California - where the film seems to take place - that is a "Commercial" license plate issued to trucks and commercial vehicles, but law enforcement are issued "Exempt" plates which are 7 numbers.