Revealing mistake: When Tommy Ross gets killed and Carrie looks at his supposedly lifeless body if you look closely you will notice he blinks revealing that he is actually alive.
Revealing mistake: When Nica crawls to the elevator to escape Chucky, she bends her legs in order to shut the elevator door. She is meant to be a paraplegic and have no feeling in her legs.
Revealing mistake: When Fin decides to help the kids on the bus and says, "Water's rising, I'm gonna go up to the bridge and rappel down," two shots later the camera zooms in on Fin's car up on the bridge, but the problem is that this shot is shown in reverse - all the vehicles in both lanes are going backwards.
Revealing mistake: When the family's car is about to be hit by the ambulance as they try to escape downtown, Gerry is driving and his wife is up, leaning over the passenger seat talking to their daughter. The camera angle changes to a view from behind, and as the ambulance is about to hit, we can see there is nobody in the car and the ambulance driver is wearing a safety helmet. This is viewable in just a few frames. (00:08:00)
Revealing mistake: At the dinner table when Lilith and Gretel are eating lunch with Lilith's "sons", Gretel takes a knife and stabs the boy closes to her in the hand. In the close up of the hand, it looks obviously rubber. That and there is already blood under it before the knife even hits. (00:37:25)
Revealing mistake: When the teenager is kidnapped at the beginning of the movie, the gun used to knock her out never makes contact with her face.
Revealing mistake: A sudden downpour hits the family's car after they leave the gas station. One shot of the front windshield shows the rain pattern going across the window in a frequency wave like fashion, indicating it is artificially produced for an effect. (00:13:55)
Revealing mistake: When the doctor intercoms the colonel because he cannot get into the medical room for the pregnant woman having nightmares, the camera shows the bridge intercom, which is simply the back end of a desktop computer with a couple of knobs stuck on it.
Revealing mistake: After Alex shoots the intruder in the head, killing him, a couple of shots later you can see his chest slightly expanding and contracting, showing that the actor was still breathing.
Revealing mistake: Not bad digital effects for a combination "Predator" and "Jurassic Park" monster movie, except that the dinosaurs don't cast shadows about half the time.
Revealing mistake: Pablo and his buddy are driving through the middle of nowhere, and end up in the bucolic town of Red Stone. The first two people they drive by are armed with machetes. The close-up of the second one is reversed, as shown by the dilapidated street sign - it can't be deliberately shown by say, the car mirror, because they are looking at him turning their head. (00:05:40)
Revealing mistake: After Paul shoots the monkey he picks it up to put it in a box and the "dead monkey" is fake. (00:51:56)
Revealing mistake: In the first part of the movie when the dad finds the house in the woods after the car accident, he walks through the door with his daughters in the snow, and just before entering we can see he walks on a fake snow carpet.
Revealing mistake: When Charlie and Lindsay are having sex, almost when they're done, a horse gets into the bed. The horse disappears too soon.
Revealing mistake: When Agnes slits Manny's throat, you can see the crease on the prosthetic part of his neck. And the blood flow looks totally fake. (00:37:45)
Revealing mistake: When Brooke arrives at the camp to drop off Steph and Chrissy, Chrissy leans out of the car and vomits, but you can see that she's not really vomiting, and is using her hand to cover up the special effects tube.
Revealing mistake: Before Derek punches the side of the wall, you can see the weakened area of the wall before impact. Look at the color difference.