The candles that light instantly as they come out of the water in the Phantom's Lair were not done by computers- special candles were used that were sensitive to air. Luckily, the scene went well and the actors didn't mess up, as when they tried to re-shoot the scene, the candles didn't work a second time.
Christine's attire during her performing 'Think of Me' for Hannibal is copied from the most famous painting of Emperess Elisabeth of Austria, also known as Sissi.
Ramin Karimloo is the first actor to have played all three of Christine's loves: her father in this film, and both Raoul and the Phantom in the stage version. Karimloo will originate the role of the Phantom in the stage musical sequel, "Love Never Dies".
The fire that burns down the opera house after the chandelier crashes was an actual fire. Joel Schumacher, wanting realism, destroyed the opera house set to film that scene.
Ramin Karimloo's entire part is a picture of him in character and a single shot, lasting less than thirty seconds, of Gustave on his deathbed.
The swordfight between the Phantom and Raoul at the cemetery was created specifically for the film.
Joel Schumacher frequently had difficulty understanding Jennifer Ellison because of her thick Liverpudlian accent.
In the stage version, the chandelier crash occurs after "All I Ask of You". However, in the film it is pushed back to after "The Point of No Return". This change was reflected in the Las Vegas version of the stage show.
When Andrew Lloyd Webber originally approached Michael Crawford in 1984 about starring in the show, and after reading the novel, Crawford made an assumption that Webber wanted him to play Raoul, and spent a year studying Nelson Eddy's performance in the 1943 film. It wasn't until he was at his audition that Crawford learned Steve Barton had been cast as Raoul a week earlier, and that Webber wanted him to play the Phantom.
The Phantom only has fourteen lines of spoken dialogue. The rest of his lines are sung.
When Christine removes the Phantom's mask, he pushes her down on the floor. Right after he says 'Curse you,' the camera goes back to her: she is half laughing.