Continuity mistake: After being abducted during the Don Juan performance, Christine changes into the wedding gown and the Phantom places the veil on her head. The veil gets thrown aside by the time Raoul arrives. Between the time Christine leaves and the mob arrives, there is a shot of the mannequin with the veil perfectly positioned on the head (although it is highly unlikely that someone took time to put it back.) When Meg walks through the lair and retrieves the mask, yet another shot of the dummy shows that the veil has disappeared. (02:00:50 - 02:09:55)
Continuity mistake: When Raoul is tied to the gate, the ropes across his chest change frequently. Sometimes there are 3 running parallel to each other, from his shoulder to the waist. Other times there is a big knot in the top rope. Still others there appear to be 2 ropes across with a third running straight down his chest between them. (02:02:50)
Revealing mistake: During the second kiss, you can see behind Gerard Butler's neck (going from under his hair down to his back) the wire of the apparatus used to keep his lower right eyelid pulled down. (02:06:05)
Visible crew/equipment: During the second kiss, the shadow of a camera is seen on Christine and the Phantom. It's especially obvious behind his neck. (02:06:05)
Audio problem: When Christine and Raoul leave the lair, singing to each other, she turns her head back toward the Phantom as we hear her singing 'each night, each morning,' but we can see she isn't saying anything: her mouth and lips aren't moving. It can't be that the Phantom is remembering the rooftop scene, because you hear the voices echoing in the cave, resonating differently as they move away. This is confirmed by the screenplay (p. 140 of "The Phantom of the Opera Companion"), which states that the Phantom hears them singing in the distance. (02:09:40)
Continuity mistake: At the end when Meg steps out of the water, her pants are wet. However, when she enters the bedroom and finds the Phantom's mask, her pants are perfectly dry. (02:10:35)
Other mistake: During the gypsy fair, when the young Phantom is hurriedly pulling the bag back over his head, you can see the actor's face from the side, through the bars of the cage. There is no deformity, even though the angle of the shot shows the top right of his face, where the mask is always worn later. Even moreso: his deformity is bumpy, and the side of his face is all baby smooth.
Factual error: Raoul is the Vicomte de Chagny and he gets called that throughout the movie, even during the auction (which shows he didn't change titles when his parents or his brother died, for example). Yet Christine's tombstone calls her a countess when it should have read viscountess - or, even better, vicomtesse.
Continuity mistake: In the last scene, Christine pulls the cover off one mirror. The coverings stay like this till the Phantom leaves, when both mirrors are uncovered.
Continuity mistake: At the end of the music of the night scene, the Phantom lays Christine down on the bed and sings the line, "help me make the music of the night." While singing this, he moves his finger down Christine's jaw line, and his finger comes off her chin. Yet when the camera angle changes, he is just starting to move his finger down her jaw, starting up near the ear. He wouldn't have had time to move his finger back up that quickly.
Continuity mistake: When Christine goes back to La Carlotta's dressing room the flowers by "The mirror" are pink, but when the Phantom shows up and she walks toward the mirrors the flowers are white.
Other mistake: When the opera cast is rehearsing "Hannibal," Carlotta is asked to sing "Think of Me" for the new owners. She begins singing the song in the musical key of F Major, but is then interrupted by the falling oleo. A while later, when Christine is singing this same song for the owners (to fill in for Carlotta), she begins singing the song in the key of D Major (which is 2 whole musical keys lower). Assuming that's the result of the Phantom's tuition (there's no other plausible explanation for the change), the orchestra conductor of the opera couldn't know that Christine needed to sing the song in a lower key. This is also the case since it seems that everyone nearby is very surprised by Christine's beautiful singing, because they had never heard her sing a solo before.
Audio problem: During the end of "Prima Donna" when everyone sings "Light up the stage." you can see some actors and actresses singing the word "light" but you don't actually hear it until a few seconds later.
Visible crew/equipment: When Christine and Raoul are riding the horse out of the graveyard, it is obvious that Emmy Rossum has been replaced by a stunt double.
Continuity mistake: When Christine is in the Phantom's lair for the second time, after the Phantom puts the veil on her head, the camera has a close up of him (during the lines 'an eternity of this before your eyes') and the back of Chirstine's head can be seen not wearing the veil. When the camera pans back to her, she is wearing the veil and removes it a little later.
Continuity mistake: When Christine is taken to the Phantom's Lair the first time (at roughly 38 minutes into the film), as the Phantom sings, he leads her by the hand from the gondola to the "Christine" mannequin. On their way, near the pipe organ is a Roman-style bust of a man's head with a dark strip of cloth askew over its left eye. When the Phantom sings "Let your soul take you." and "Savor each sensation." the strip of cloth is wide (like a sweat band), but when he sings "Let the dream begin." a 10th of a second later, the cloth has become very narrow - thin, like a bow tie. It turns back into the sweat band version again after Christine's nap.
Continuity mistake: When Christine enters Carlottas dressing room after Hannibal, there are two stands of roses by the door. After she's changed there is only a small vase of roses, but the stands must have been way too heavy for her to move herself.
Continuity mistake: When the Phantom first brings Christine to his lair, just as he walks up the steps note the four piece candelabra in the background, it has candles much smaller than they appear later in the scene.
Continuity mistake: In the last part of the movie, when Raoul is all tied up, the Phantom pulls the rope around his neck, and mucous comes out of Raoul's nose. The camera turns, and then goes back to him, and the mucous is gone.
Continuity mistake: The lower lid of the Phantom changes from looking normal (when he's got his mask on) to deformed (when he takes the mask off). No makeup could hide that and considering the size of the mask's holes, this should be easily visible at all times.
Suggested correction: When you watch "love never dies" he leaves her because the phantom won the bet, it's implied they got a "divorce" so she is still a countess.
But, in love never dies, it shows Christine dying in the year 1910, (when the whole thing was set) but on her tombstone, it shows that she died in 1913. Since Gustave is ten years old, this would make Christine in her late forties-early fifties when she had him, which is practically impossible. This is why I love LND's music, but the story is just too cheesy and inconsistent to the original for me. Since the original creator of the musical, Andrew Lloyd Webber, has chosen to call it a "stand-alone piece." and not a sequel, I would not use it as a reference for future endeavors with the trio.
Vicomtesse and Comtesse are two completely different titles. For Christine to become a Comtesse, Raoul would have had to become a Comte, but he didn't. He remained a Vicomte, therefore, Christine's tombstone should have read Vicomtesse de Chagny. It doesn't, so this mistake is valid.