Continuity mistake: The position of Richard's legs change when he is dead on the stairway landing. Initially, Richard's right leg is bent at the knee and pointing toward the lower flight and his left leg is straight, going up the wall to the next flight. Richard's legs quickly switch from this position when Grace is approaching the landing to his right leg going up the wall and his left leg not visible when Grace reaches the landing. An aerial view then shows Richard's legs back to their original positions. (01:36:27 - 01:37:12)
Continuity mistake: When the girls bring a birthday cake into Judy's room at the first time, her bed sheet is patterned with what looks like flowers but when Judy is fast asleep the next time, the sheets are plain white. (00:52:30 - 01:15:30)
Continuity mistake: The inspector is showing the singer the gruesome images of her friend. As he says "It's how we identified the remains", she raises her right hand, but in the next shot it's with the left hand that she's touching her lips. (00:04:45)
Continuity mistake: After take-off, Mr. Anderson's hair changes a few times while he was talking to Rochelle. His bangs are combed back, but then he has strands hanging down his forehead and the top of his hair is dishevelled. After the camera shifts to Rochelle and back, Mr. Anderson no longer has the strands down his forehead but the right side is messy. When the camera shifts again, Mr. Anderson's hair is neatly combed back. (00:14:54 - 00:15:25)
Continuity mistake: When Charlie throws Scott over the balcony, he crashes into the chandelier and it partially tears away from the ceiling. Sparks ensue, but the light remains fully functional. The camera switches to Scott on the floor then back to Charlie where the chandelier can be seen worth all but one light out. There is no visible difference in the room lighting. Later, when Charlie is chasing Scott and Annie with the shotgun, Charlie screams "Lights out!" and shoots a fully functional chandelier.
Continuity mistake: Cory threw the tire iron across the road, where it landed near a tree in the second or third row (lower right-hand corner of the screen). Reina and Vlad walked well past that area, much deeper into the woods, where Reina found the tire iron - despite her even telling Vlad the tire iron couldn't have gone so far. (00:06:00 - 00:09:57)
Continuity mistake: The girl and guy are in a hotel room and she kisses him good bye. You see her go out of the door and the door handle is on the left side and no chain hanging. Then when you see the door a few seconds later the door handle is on the right and the chain is latched.
Continuity mistake: There wasn't much blood noticeable on the axe after it was used to chop off the mermaid's tail, but a little later when the man was carrying it over his shoulder, it was heavily covered in blood and dripping. (00:14:17)
Continuity mistake: When George gets shot, he lies flat on his back. When Gloria walks in on the scene, there's a closer view of him and he is lying on his side. (01:18:45)