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Even the best films can be plagued by little mistakes like a misplaced bit of equipment or the visible reflection of a crew member.
The top ten worst-offending films amassed hundreds of errors between them, as spotted by eagle-eyed contributors at moviemistakes.com:
Almost tied for blooper first place are Vietnam War epic Apocalypse Now and Alfred Hitchcock's classic thriller The Birds.
Not one but two Harry Potter films are also in the top ten, as is the first Pirates of the Caribbean film.
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