Audio problem: In the scene when Mud and his "dad" are getting ready for Celeste to come over, Mud bounces a basketball across a hardwood floor but it makes no sound.
Revealing mistake: In several scenes, it is obvious that the animal actor playing Bagheera is actually a black jaguar. For example, the jaguar is larger and heavier than the leopard/panther. The scene where Bagheera tackles a poacher, he is much too large and heavy to be a leopard/panther.
Audio problem: About halfway through the movie, Richard and Fantasy reunite on the island. Richard says, "Fantasy." and Fantasy responds with, "Well, what were you expecting honey? The tooth fairy?" When she says "the tooth fairy" her lips are saying something completely different (and it's even worse, since it's a close-up of her face).
Factual error: Near the end of the film, the movie changes locations to Seattle. A skyline is shown and it is identified as Seattle. The city skyline that is shown is actually Philadelphia.
Continuity mistake: While Bill waits for his brothers in the car, he looks toward the store and watches his brothers inside. The first shot of Bill's perspective of looking at the store, there is a reggae black man walking by. Then it switches back to Bill's face, then again at the store and the man walks by the window a second time in the same direction. When Bill gets out of the car and crosses the street the black man walks by a third time.
Continuity mistake: Throughout the entire movie, the irregularly-sized characters are constantly changing size when compared to one-another. Except for Barky (even Junior, he is awfully big for a baby) I.E. when Bastian accidentally steps on the gnomes' house, the gnomes are the height of Bastian's shoe, yet when they run out of the house, they are as tall as his leg up to his knee cap.
Continuity mistake: Despite making the jump with Eddie from one building to the next, the two goons come out of the original building they jumped away from. (00:27:00 - 00:28:20)
Revealing mistake: When they are stopped after curfew by the Mohawks, Hawk jumps at the window and orders them to give them 50 bucks to go on, and they accept credit cards. When saying this, you can see the dividing line between his real skin and the fake head cap that supports the actor's fake hair.
Factual error: In the saloon at night, Ben Wheeler says, "I can't afford another Workers Comp claim". Workers compensation wasn't started in the United States until 1902. (00:10:25)
Visible crew/equipment: After the little girl leaves the grocery store with Dodger, the monkey, the overhead microphone can be seen above her head.