Continuity mistake: When Hauser picks up the Admiral, after the Brain Bug attacks them, she has no yellow alien blood on her as she's being pulled up, but when the shot changes, as she's standing up, she now has blood on her face and uniform.
Continuity mistake: When Bella and Edward talk in the woods, Bella drops her backpack in front of a tree. In a subsequent shot, the backpack has disappeared. (00:49:55 - 00:50:55)
Continuity mistake: When Seth has been sliced by the blade, he spits blood that goes all over his face. It then cuts to Hoffman looking at him, then back to Seth, and now the blood on his face has gone. This happens three or four times. (00:05:10)
Continuity mistake: James takes off his tie to cover the cut on Kristen's hand, but when they run outside to escape in the car James is wearing his tie again, then after the failed escape they run back inside the house and James tie is missing. In another scene Kristen goes into the woods to look for James and falls into a ditch, then as she climbs out the tie is missing from her hand, but the next scene it's back in place.
Continuity mistake: As Ben and Jane drive down the road, it is raining. After they hit the ghost, the scene fades to black. When the scene fades back in, it's heavily snowing, and a previously nonexistent thick sheet of snow is covering the ground. As they get out of the car, they start talking. During their conversation, there is a quick cut, and with this, it instantly stops snowing.
Continuity mistake: When Oskar shows his Rubik's Cube to Eli and explains how it works, one side is all white except one square, which differs from being red vs. blue between shots.
Continuity mistake: When the group enters Shangri La, Alex runs down toward Zi Juan and the fountain. Before he gets there, we get to see wide shots from behind him of the ground to his left which is rocky with no path, and we also see that no-one is following, yet in the next shot from the front, Zi Juan's daughter appears instantly to block her mothers sword swing. There was simply not enough time between shots for her to accomplish this, and even if it were possible, her mother would have seen her approaching.
Continuity mistake: When Nick and Bobby are playing craps in Rusty Nail's barn, Nick rolls "chest," resulting in Rusty branding Bobby with his R key chain. Rusty puts the red hot key chain in Bobby's shirt pocket and holds it against his chest. When Rusty lets go, you can see a hole has been burned into Bobby's shirt. The very next shot, Bobby is rolling the dice and his shirt is intact. Later on at the very end of the film, Bobby's shirt has the hole in the pocket again. (01:13:50 - 01:15:00)
Continuity mistake: Despite being one of the few slasher films with a PG13 rating, whenever someone is stabbed, their bodies show no stab wounds when they appear again in the movie. The only character with blood stains where they had been stabbed has no holes in their clothing where the stab would have been, only blood stains.
Continuity mistake: In the scene where Lloyd is briefing his team about the events of the next few hours, there is a shot in which he says the words 'weather systems' as someone walks across the screen from the right. Immediately the camera cuts to a close-in shot of Lloyd. But right at the end of the scene, the exact same shot is shown again, minus the sound of Lloyd saying 'weather systems'.
Continuity mistake: During the song "Night Surgeon", when Pavvi says: "He'll paint your ass like a Rembrandt", Luigi's face changes from looking at Pavvi to looking at Nathan between cuts.
Continuity mistake: Just after fake Amy in the mirror starts to cut her daughters neck slightly with the scissors, the real Amy having escaped the bathtub grabs her daughter and puts her in the corner of the room. Soaking, she removes her top exposing her right breast and nipple - next shot she has a soaked singlet on which wasn't there a second ago.
Continuity mistake: When Amy says that she lost her earring, she's wearing shades. The shot cuts to Stacy and then back to Amy, who is now wearing spectacles without having had enough time to change her glasses off screen. (00:03:40)
Continuity mistake: At one point, when Leon is fighting with Mahogany on the train, there is a shot of blood dripping off a knife onto Leon's face. This blood later vanishes. (01:20:02 - 01:21:19)
Continuity mistake: Amount of liquid in glass changes from when she fills it to when she takes her first drink. (00:02:50)
Continuity mistake: Sarah is called Cross, but her name is listed as 'Bowman' in the credits.
Continuity mistake: When Miki's husband is killed by the shuriken (large throwing stars), they enter and exit his body vertically (you see them embed themselves into the wall vertically), yet when he falls to pieces, the cuts are all horizontal.
Continuity mistake: During the sex scene between Milo Ventimiglia and Lauren Lee Smith, in which the fat guy was found dead, three consecutive shots showed that Milo Ventimiglia has his shirt on on the first, then the shirt disappeared on the next, only to reappear on Milo Ventimiglia's body again in the third shot.
Continuity mistake: At the end, Casey and Elaine flee the house in the Volvo and find Chloe's crashed SUV. As Casey goes to investigate the SUV on foot, Miranda suddenly comes sprinting out of the woods, intending to kill Casey. To save Casey, Elaine rams Miranda with the Volvo, slamming her into the rear of the SUV. A camera shot from inside the SUV looking out shows that Miranda impacted right in the center of the SUV's rear hatch. In the same shot, we see Miranda's lifeless body slowly slide straight down the hatch, meaning her body should have collapsed directly between the Volvo and the SUV. When the camera cuts to an exterior view, we see Miranda's lifeless body stretched out in the snow (parallel to both vehicles) a couple of feet away from the Volvo's front right fender; so her body is now about 6 feet away from where it should be.
Continuity mistake: When the first guy out of the main 3 is dragged to the hunting range (after having his spine exposed and meat cut off), he falls backwards into the snow and when he sort of rolls over, there is snow all over his exposed backbone and flesh but when he stumbles and gets up, there is no evidence of snow whatsoever.