Continuity mistake: When the two men are carrying the Christmas tree on the road, it is a huge tree, but when they carry it through the door into the house, it is significantly smaller.
Continuity mistake: When Sarah is on the beach in a gown and slippers, she takes the slippers off, then they are back on, then seen off, on the sand, again.
Continuity mistake: All wide shots of Hrothgar's hall show it in the outer ward of his fortress, about two hundred metres from the towers on the edge of the cliff, with open ground on three sides and an embankment on the fourth. But later several characters are able to step straight out of the hall onto a balcony that overhangs the cliffs and sea below.
Continuity mistake: When the girl is looking up the fire engine in the oversized book, the little blonde boy in the red T-Shirt on the stool next to her changes the position of his head and hands between shots as she brings the book to the desk.
Continuity mistake: When Vivian is walking to meet Aiden for their date, Vivian's dress changes from black to brown.
Continuity mistake: When the helicopter plummets into the wedding terrace, its nose is either pointing the right side or the left, depending on the shot. No continuity at all.
Continuity mistake: In the beginning of Part 3, Ryan Reynolds is on a deserted two-lane highway asking Hope Davis for help. She refuses to help, begins to turn and walk away down the double-yellow center lines of the road. In the next shot, we see her finishing the turn and walking on the edge of the road, by the white line (facing traffic). Immediately after, she is shown on the right side of the road, on the other white line (walking with traffic). (01:14:15)
Continuity mistake: When Frylock is watching New Jersey getting destroyed by the Insane-O-Flex, look for a building to the left through the Ferris Wheel. When Meatwad transforms into a building, the fires briefly stop, then turn on again.
Continuity mistake: When the dead girl in a red raincoat appears in the doorway, at first the damage is on the right side of her face, next shot on the left, then in the third shot it has gone back to the right.
Continuity mistake: Anxious to gift-wrap more pork, Angela scuttles by her uncle and tries to take over. He replies "Brown paper and tape", and she desists. This short exchange consists of three cuts where Christina Milian's hand goes up, is down but off the counter, and then down on the counter. (00:00:45)
Continuity mistake: Throughout the movie, Cinderella's hair goes from loose to being tied into a ponytail.