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In the 2002 movie, The Lord of the Rings: The Two Towers, the character of Éomer is played by Karl Urban—except as some fans noticed towards the very end, at one point, he simply is not. While Karl's character is meant to be sitting on a horse alongside his peers, it's actually the face of his stunt double that made the cut instead.
During the director's commentary for the movie, per WhatCulture, Peter Jackson admitted that they just didn't get to replace the face before the movie hit theaters.