Other mistake: When Skinner calls his lawyer he never dials the phone.
Other mistake: After all the plants have stopped being pollenated when the pollen jocks are getting ready for liftoff you see the branches outside the window have green leaves.
Other mistake: Being a three time mom, I know that the sonogram that Susanne gives Nick at the beginning could not be hers, due to the fact that she just found out she was pregnant. The babies on that sonogram are too detailed. They have to be at least 30-35 week-old fetuses. At her stage, you would not be able to make out the baby.
Other mistake: When Nancy finds the trapdoor from the attic, she goes down a ladder and gets onto the other floor. She walks a bit and goes down another ladder then looks up and Ned throws the flashlight straight down to her.
Other mistake: When the cleaning crew is leaving Joe's apartment, you can see a green Oreck commercial vacuum. The handle is on backwards.
Other mistake: In the last battle scene, the same death is shown twice. Just before 1h32, a Magisterial guard slumps towards the left foreground, his daemon bursting into dust from the right; and two minutes later just before 1h34 the same piece of footage is shown again.
Other mistake: Right at the beginning of the movie, when Lewis's real mum picks him up from the box and hugs him, it's no more than three seconds before she hears Lewis from the future slipping on the step. She gets scared and puts baby Lewis back in the box. When Wilbur takes Lewis to meet his mum, near the end of the movie, the time his mum holds the baby is more than twenty five seconds.
Other mistake: During the credits, Squogre is spelled wrong, as revealed in the DVD commentary. It's spelled as "Sqouger"
Other mistake: In his search of Giselle, when Edward knocks on doors 209 (hissing cat), 405 (barking dog), and 714 (purple guy), the funny thing is that in all three close-ups the three door jambs/trim have the same paint glob markings. The actual doors were changed, but the jamb/trim remained the same for all three shots. (Only visible on widescreen DVD). (01:04:05)
Other mistake: The ink on the pad and the ink on the stamp that Fred marks the kids "nice" are wrong. If you look at it Fred doesn't hit all the colors in the pad. He only hits one color.
Other mistake: In the Forbidden Forest, after Grawp has put Hermione down after grabbing her, he turns round and bends down to pick something up. When the shot turns to Ron, Hermione and Harry they are still looking up at Grawp even though he's bending down. Their position doesn't move. Ron even looks Grawp up and down, even though he's still bent over with his back to the students. (01:27:10)
Other mistake: During the baseball game, Ryan's team was in the field first meaning they were the home team. After Chad scored giving his team the lead, Ryan's team should have batted again since, according to baseball rules, home team bats last.
Other mistake: Whenever the fire scene is going in slow motion, the fire in the background is not in slow motion. (01:07:00)