(at around 30 mins) When Derek went to the kid's room past the cat, there is no toy alligator, but after he starts to climb up to bed there is now a toy alligator which he falls on.
The flight instructor picks up his tennis racket twice without putting it down in-between.
Just before pushing Tracy, Derek's right wing disappears then reappears two shots later.
When Thompson gets into a fight with Tracy, his social worker, in one frame, he lacks his right wing, in the next frame he has it back.
During the Tooth Fairy's first assignment, he makes his escape on the boy's skateboard. As we see him heading down the hallway, he is as tall as a low table, but seconds later, he is clearly still only six inches tall.
Vehicles in Michigan only receive one license plate, so the Corvette would not have one on the front.
During the opening scenes a member of the opposing team loses a tooth due to Derek hitting him, the area announcer says that it was an incisor. However, the tooth shown flying in the air was a molar.
When the kids are asking for Derek Thompson's (Dwayne Johnson) autograph, you can plainly hear many of the kids yelling "Mr. Johnson".