Revealing mistake: When Julie is trapped in the bathroom with the "ghost girl" she is saved when some other girls come in and switch on the lights. However, if you watch the girl who flicks the light switches you can see the switches are already in the "on" position (pointed upwards) and she simply mimes flicking them up. (00:26:47)
Revealing mistake: During the nativity, when the baby is born, to the right of Mary, there is a boy tipping his candle on it's side. In the next shot, this same boy has the candle on his mouth.
Revealing mistake: When Larry floats drowned in the pool, his face remains motionless until the very last second, when he starts to chuckle: probably a flaw of the actor straining for the last bit of air.
Revealing mistake: When Georgia and Poupi are walking back towards the bus from the store where she buys food for everyone, several bystanders at both sides of the road just stand there looking at the camera. (00:17:30)
Revealing mistake: Nick's reflection is seen in the shiny ceiling, but the guns floating above him have none, revealing this to be a CG effect. (00:54:50)
Revealing mistake: When Mr Goodall is attacking the bloke near the start, he is supposed to be hitting the other man really hard, but doesn't come close to hitting him.
Revealing mistake: The pic of Shawn's father and Evan on the PC seems very fake.
Revealing mistake: The movie shows in Matrix-esque slo-mo the double baton swing Goku dodges, from Fuller and his goon. They are nowhere near hitting each other, and yet, this missed baseball-bat swing causes them to KO each other in close-up. (00:16:55)
Revealing mistake: During the fight scene at the rest area, Gina is hitting Dick, and her sweater rides up her back, revealing the battery pack for the microphone taped to the small of her back.
Revealing mistake: In the evil woman's dramatic scene after she kills the children, her knife flops around like it is made of rubber, but sounds solid when she throws it in the sink. (01:22:35)
Revealing mistake: When the charity workers are unloading the food in Styrofoam packages at LAMP, the light shining through the packages reveals that they are empty.
Revealing mistake: When Needy uses her key to unlock the door, you can see the door is already open. (00:58:07)
Revealing mistake: When Connor jumps out of his uncle's car before it crashes into the lake, it's obviously a stuntman. His hair is darker and straighter than the actor's. (01:22:40)
Revealing mistake: After the 4 have been tied up and babyface has killed their captors, he grabs Alexa by the neck. There is a shot of him from behind and you can see the make up covering the back of his head/neck coming up above his collar.
Revealing mistake: In the scene where Marshall "Lube" Lubetsky has just fallen out of the cable car on the mountain and Ashley climbs down to get to him we see foot prints in the snow coming from the trees on the side to where Marshall is lying, giving away that the actor walked to that position, when the character is meant to have fallen there.
Revealing mistake: When the girl is giving the guy a blow job in the school restroom, he finishes in her mouth. She goes to the sink and spits it out. You can obviously tell she had a mouthful of water going by the color and quantity. (00:20:45)