Revealing mistake: After John and Nelson are led to their prison cell, Nelson walks to the toilet and starts complaining about how disgusting it is. When Nelson steps away from the toilet, he breaks down in tears and let's himself fall backwards against the 'stone' prison wall. The wall is seen moving, which reveals it's not a real stone wall, but made from a softer material, like wood or plastic. (00:25:15)
Revealing mistake: When Selene falls into the tunnels of Tanis's lair where the lycans are, you can see the pad she lands on. It's almost passed off as falling snow, but watch how as she lands the 'ground' squeezes like a pillow. This was pointed out in the director's commentary. (00:44:00)
Revealing mistake: When the dad inserts the rectal thermometer into Calvin and he looks up, the CGI head is too obvious, especially when he is putting his head back down on the bed.
Revealing mistake: When JB and KG are doing the powerslide in the Rock N Roll History Museum, you can see that KG is wearing knee pads to help him slide.
Revealing mistake: Lighting screens are reflected on Casey's chess opponent's glasses.
Revealing mistake: When Jack drives the bus down the alley, it knocks a series of A/C units off a building. The last one comes open and there is obviously nothing inside. (01:12:35)
Revealing mistake: In the scene where the grandfather has passed away and the family is at the hospital, there is a shot where the family steals his body and pushes it out a window. At one point in the next shot, when the family is carrying "him" to their van, the sheet moves and it's obvious the cast is carrying a bunch of pillows covered in a sheet. This also is obvious from the ridiculous way the "body" is laying on the bed prior and folds up when the cast picks "him" up and hoists "him" out the window.
Revealing mistake: When Harry Judd drops his drumstick down the trapdoor backstage, watch him carefully - He actually opens his hand and chucks it forward slightly.
Revealing mistake: As Bobby and Brenda are loading the bodies into the van, Lynn can be seen breathing.
Revealing mistake: When the woman is taking the pictures at the start, the camera lens has got the cover over it. (00:07:00)
Revealing mistake: After Raye has finished writing down the agent's names onto the piece of paper on the subway, the "dead" man next to him can be seen swallowing. (00:57:30)
Revealing mistake: As one of the pilots opens a hatch to check on the failed "avionics" a side cockpit window is visible above and behind him. Rain on the window is moving directly downward, an impossibility at hundreds of miles per hour.
Revealing mistake: Early in the movie, there is a visible circular, plastic looking effect on Gideon's arm as he removes the bullet with the knife. This is more noticeable around his shoulder when he cauterizes his wound with the hot knife.
Revealing mistake: In a scene where Fido is turned around, you can see a part of his head that is pink. However the rest of his body is grey.
Revealing mistake: When Landfill's wake is knocked over and his body falls on the guy, his eyes are open for a second or two before the scene ends.
Revealing mistake: When Bobby is being chased by the police in his Dad's car it is blatantly obvious that a stunt double is driving.
Revealing mistake: When Gabriel Noone goes to see "Peter", he arrives in rural Wisconsin, looks out of the window of his car, and sees a mountain in the distance. There are no mountains in Wisconsin.
Revealing mistake: In the scene where Rooster is driving/running away from the gangsters, he is supposed to be alone in his car but in one shot a hand appears and is holding on to the passenger side door from inside the car.
Revealing mistake: Watch carefully after Angela is thrown through the windshield of the bus. There is a shot of diamonds and blood-stained glass scattering on the floor. But in reality, there is a shot of plain diamonds falling and the bloody glass is faded in during the middle of the shot. Most visible on the edges of the screen, where the pieces emerge from nowhere.
Revealing mistake: When the dragon is hatching, a light bulb is visible just behind and to the left of her egg. (00:14:10)
Suggested correction: What appears to be a light bulb in the wide shot is actually a leather strap attached to a larger leather item. This can be seen more easily in the close up shot in the moment after the egg fully breaks.