Revealing mistake: At the end of the film, the screw is tapping on the window to get out and Hogarth moves to put the box down. The box completely vanishes from the shot for a few frames towards the end of the shot.
The Iron Giant (1999)
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Directed by: Brad Bird
Starring: Jennifer Aniston, Vin Diesel, Harry Connick Jr., James Gammon
Continuity mistake: Kent Mansley, the investigating government officer, can be seen sitting (humiliated) in the back of an army truck in a convoy leaving the scrapyard (after he has been told by the general that 'he will be in charge of the toilets from now on'). A few minutes later he is driving a 'civilian' car in the middle of that same convoy. (01:01:05 - 01:04:45)
Kent Mansley: The biggest thing in this town is probably the homecoming queen.
Trivia: After Mansley's car is eaten by the Giant and disappears, Mansley is trying to get Marv to look at it but doesn't realise it's gone yet. Marv then asks, "What are we looking at here, Manly?" leaving out the S in Mansley to call him Manly. This was a mistake on the voice actor's part, but Brad Bird liked it and thought it appropriate for the character, so left that take in.
Answer: Turn back to/from what? Can you please expand on the question so we know what you're referring to?