Visible crew/equipment: During the graveyard swordfight, the Phantom's stuntman sometimes visibly replaces Gerard Butler. He has thin and very arched eyebrows and the mask doesn't fit properly around the nose. He is the same stuntman used when Raoul jumps down the hole after the Masquerade.
Visible crew/equipment: Right after Christine is shown on stage singing "Think of Me", the camera pans out to show the audience members. When it gets to the back of the room on the floor, you can see at least 5 dummies used as seat fillers. They look to be only torsos and heads sleeveless t-shirts on.
Visible crew/equipment: When Raoul jumps down the hole into the mirror room, you see he is alone. Between when he jumps down, and the appearance of the phantom's reflection, if you slow down the movie you see a man in a gray shirt in the mirrors behind Raoul. He appears in at least three mirrors. Slow-mo is not essential but does help.