Continuity mistake: When Valiant flies down the gun barrel, he takes off his backpack and helmet, and he lays them down in the barrel before squeezing through the back of the gun. When he comes back out through the gun with the other birds, the backpack and helmet are not there.
Continuity mistake: During the scene where the baby is peeing on Tim, in one shot his hair is wet, in the next it's dry and in the next shot it goes back to wet again.
Continuity mistake: As Kristy is being loaded into the trunk of the car, the bottom of her feet are perfectly clean. She was running barefoot all night through blood, dirt and mud so her feet should be filthy.
Continuity mistake: In the bedroom scene the bedding at the head of the bed slightly changes from one position to another and then back again.
Continuity mistake: When Dorthy runs back into the trailer to get her pet the windows break and are all messed up. But look at the window that breaks in one shot it is perfectly fine next messed up. It changes many times thought the whole scene.
Continuity mistake: In the scene when the man on the horse tries to get the case, you can plainly see that his scar changes from dark to bright red and then back again.
Continuity mistake: Just before Bree and Toby have their car stolen, it has Maine license plates. In every other scene it is shown with New York plates.
Continuity mistake: When Beowulf enters the water cave and seeing Grendel's body, the initial shot has his right arm sitting next to him (most likely placed there after his mother's took it from the Meat Hall). When Beowulf leans over to touch Grendel's chest, the arm is gone.