Continuity mistake: In the scene where Fantine is dying, she asks Jean Valjean to give a necklace to Cosette. There is a closeup of Fantine's head and neck and Valjean's hands enter the shot and begin to remove the necklace. A moment later she begins to cough and there is a cut to a two-shot of the pair from a few feet away. Valjean's hands are nowhere near her neck in the second shot.
Factual error: In the chapel sequence in which several young women are making their religious professions, the priest mispronounces the words "caelis," "sanctificetur," and "caelo." In the norms of ecclesiastical Latin the letter "c" when followed by the vowel "e" or the dipthong "ae" is always pronounced as the English "ch."