Pride & Prejudice
Pride & Prejudice mistake picture

Revealing mistake: On many occasions throughout the film, Keira Knightley's real, short hair can be seen under her wig.

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Revealing mistake: Throughout the dance scene between Darcy and Elizabeth, a small earpiece can be seen in Elizabeth's ear. I would assume this is to help with the dance steps. This can also be seen during the dance with Mr. Collins, however it is not as noticeable.