Corrected entry: On the opera house's rooftop, Christine, sick with worry and fear, decides to run away with Raoul right after the performance so that he can hide and protect her from the Phantom, and tells him to prepare his horses so they can leave right away. Then nothing happens. We're brought three months forward to the masquerade and no mention is ever made again of what happened to change their minds and why they did not run away. If she is scared enough to want to run away right away, not even waiting until the next day to pack her things, there is no way that she'll feel comfortable and safe enough to come back within a mere three months. While in the stage show, that was due to the hubbub surrounding the chandelier crashing, that event was pushed back later in the movie, leaving a gaping hole in the plot.
Corrected entry: If Gustav Daaé died leaving his daughter in utter poverty, why is he buried in the largest mausoleum (which, presumably, cost the most) in the cemetery? It can't be a family mausoleum, since he's Swedish, not French, and the only reason Christine remained in France is because he died.
Corrected entry: When Carlotta starts to sing "Think Of Me" she lifts her chin when singing the high note at "you'll". Classical singers are taught from the very beginning of their education that the chin is to be dropped, not lifted, when singing high notes.
Corrected entry: In the Don Juan opera, just after Carlotta's solo, she and the chorus sing their final chord as they point into the audience. The camera moves across towards centre stage. Minnie Driver, obviously thinking she is out of shot stops singing, laughs and jokingly fights for position with the man standing next to her.
Corrected entry: The chandelier is gaslight. When it breaks off and falls from the ceiling, the gas should have been disconnected. Instead of burning brightly all the way to the floor and starting a fire, it should have gone out and plunged the theatre into darkness. This is what happened in the real Paris Opera house, in the original book, and on the Broadway version. Only in the movie is the chandelier capable of starting a fire after being disconnected.
Corrected entry: In the "Masquerade" scene, there is an up close shot of a female dancer who is lined up on the stairs and is dressed in black, wearing a black mask, and holding a fan. The shot lasts for a couple of seconds, but if looked at closely the girl is Emmy Rossum. In this shot, Rossum looks to her left, covers her face with her fan, looks to her right, covers her face with her fan, then looks directly into the camera. You can recognize Rossum by her distinctive mouth.