Continuity mistake: During one scene in Camryn's Halloween birthday party (where she is wearing a silver mask), it is actually Tia playing this role instead of Tamera.
Continuity mistake: When Amanda and Daniel entered the bathroom from 'Saw', Adam's body is shown with his right leg shackled. However, in 'Saw' and in Adam's death flashback in 'Saw III', his left leg is shackled. (01:14:10)
Continuity mistake: When John is driving to work and he hears Anna on the radio, he swerves to avoid a car. From inside the car you can see that there are no cars in the rear window, yet when the shot changes to an outside shot, there are 3 cars. (00:33:35)
Continuity mistake: As the gang drives towards the cave entrance, the spare wheel on the back of the car that Sarah is driving switches sides three times. (00:16:30 - 00:17:10)
Continuity mistake: When Constantine manages to get the mirror through the window he falls on his back. To the right on the screen a chair lies on the floor beside a dresser. A few shots later when it cuts to Constantine getting up we can see the chair has changed position as its back now covers the opening of the dresser. (00:08:15)
Continuity mistake: When Billy is holding logs still for George to chop, the second log he puts on the stump is stripped of any bark. But when George swings down to chop it, the log is suddenly covered in bark. (00:50:45)
Continuity mistake: As Rachel is preparing the peanut butter and jelly sandwiches, she places the knife on top of the open PB jar in a closeup, but in the very next shot the knife has disappeared, then reappears again. (01:23:15)
Continuity mistake: When Paxton & Kana escape the factory by stealing a car, he checks his rear-view mirror to see the car pursuing him - the road has a dividing dashed white line on it. When the angle changes to see them driving away from the camera, there is no line on the road. Approx. time code 1:20:00.
Continuity mistake: The male lead is seen reading an article in the newspaper, the headline of which says "serial killer arrested at Pendleton University," but when he reads the headline aloud, he mentions the professor that killed students at Alpine University, which doesn't match the headline from the paper he's reading.
Continuity mistake: Nick's shirt he gave to Carly is way too big on her when she first puts it on. In the next scene it fits like it's her own shirt.
Continuity mistake: When the hot blonde gets out of the water she is supposed to be naked, as 5 minutes before we saw her take off her bikini bottoms, but as she walks out you can see she still has her bottom half on. (00:20:55)
Continuity mistake: When Tyler is resuscitating Katherine he cuts and then rips her swim suit down to her belly button, but in the next shot when she is climbing up the cliff the cut is only up to her breast bone and has a zip on it.
Continuity mistake: When the Seagrass is attacked, the two girls are thrown through the cabin's rear windows, landing on the outside deck. When the boat's owner finds it, a camera circles the Seagrass from a distance and the rear windows are intact. When he and Elizabeth board the boat, the windows are again broken. (00:26:40 - 00:42:15)
Continuity mistake: In the last scene of the shoot-out, watch as the blood pattern changes on Baby's left cheek and lip area.
Continuity mistake: Right after the beginning credits, Jacques the chef walks through the door holding a plate of food with both hands. When the shot changes, he is walking through the door but is now holding the plate of food with one hand and has a fork in the other and has just taken a bite.
Continuity mistake: When Chelsea returns back to the house, she runs through the front doorway and the door behind her is still open. In the next shot, the door is closed.
Continuity mistake: During the taxi chase at the beginning of the movie, the damage done to both cars changes between certain shots.
Continuity mistake: After Amy stabs the knife into the table next to the bed, it changes position in following shots.
Continuity mistake: There is blood on Samantha's gloved hand when she presses the keypad, but there is no blood on the keypad after she removes her hand.
Continuity mistake: In one scene with Dahlia and Ceci sleeping in the same bed, Dahlia is awoken from a bad dream. The kid rolls over and pulls the blankets over her shoulder. The next shot, from the hole in the ceiling, shows the blankets around her waist.