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Continuity mistake: Enjolras is holding a book during his protest which disappears and reappears at will.
Continuity mistake: After Eponine dies in Marius' arms, Enjolras and Combeferre lift up her body. Enjolras' position changes from right to left.
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Continuity mistake: At the start of "One Day More", Eponine is holding Cosette's letter to Marius. It is crumpled and wet in close up but brand new and dry in the wide shot.
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Continuity mistake: When Enjolras is shot dead, he falls out of the window while holding a red flag with both hands. When he gets hung up, he's holding the flag with just one hand.