Revealing mistake: When the kids break the pipes in the bathroom, the dude sitting on the stall is wearing a visible thong while on the toilet.
Revealing mistake: When Giovanni Jones performs his first note after Bugs Bunny takes over the conductor's duties, Jones's hands turn white.
Revealing mistake: When the crew does their first choreography practice with the new Bella, in the top left corner you see Amy and another Bella holding another girl in the air. You can see she's standing on a table, basically supporting herself.
Revealing mistake: During the interview, you can see a monitor with the lyrics of "Something", even though he is supposedly improvising.
Suggested correction: This is a deleted scene. It is in the extras on the DVD but it is not part of the movie.
Revealing mistake: Early in the film, when Rockbottom is driving the van round the roundabout several times, it is an aerial shot filmed from a helicopter, as the helicopter's skids are in the shot.
Revealing mistake: Locked out of the house, Katie has to wander around naked. Or rather, in her skin-colored tight fitting underwear. (00:16:22)
Revealing mistake: When the charity workers are unloading the food in Styrofoam packages at LAMP, the light shining through the packages reveals that they are empty.
Revealing mistake: A jump cut is visible when Frankie Sharp starts receiving the show in his limo. Notice how his feet shift slightly when the image changes.
Revealing mistake: The palm trees next to the building Arthur came out were not real trees. One is flush against the front wall of the building and another is in a nearby corner. The palm tree in front looked completely flat - like a large piece of cardboard or maybe painted on the wall. Palm trees should be at least 30' away from a structure as well as outdoor pipes, buried lines, etc. They grow a big central root below the trunk and MANY thin roots running horizontal close to the surface - some may be exposed. (00:05:51)
Revealing mistake: When DJ gets arrested, handcuffed and put in a police car, it's shown that he's actually holding his own cuffs.
Revealing mistake: After Fritz throws the paper airplane, when it flies into the first locker and comes out through the last locker, the wire pulling the paper can be seen here and then again in a following shot. (00:16:05)
Revealing mistake: In the opening scene the Club's dancers are in full-swing, including the tall, lanky gentleman from Lautrec's famous Moulin Rouge poster, the one with the very angular, extended nose and chin. In several closeups it's very plain that the chin is a makeup appliance: the edge of the appliance isn't blended very well with the actor's real skin.
Revealing mistake: The fish they were catching were already dead.