Revealing mistake: The fish they were catching were already dead.
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: 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: 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: 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: 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 kids break the pipes in the bathroom, the dude sitting on the stall is wearing a visible thong while on the toilet.
Revealing mistake: Whenever Ralph is driving Travers in the limousine and the exterior of the car is seen in a long shot, there is no one riding in it other than the driver. From every view point of the windows that can be seen, there is no passenger inside where Travers is supposed to be seated.
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: 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: During the sax player's solo (final concert), his fingers don't match the notes, and he stops moving his fingers before the solo is over. Also, the sax player in the blue jacket behind Buddy's right side often lags behind the sax player to his right. At times, it looked like the sax player was watching the sax player next to him to know when to play. Sometimes, he would put the reed in his mouth for a fraction of a section and just pretend to be playing. Near the end, both sax players seem lost and even laughing at themselves. (01:47:17)
Revealing mistake: At the pool party, when Ike loses his temper and knocks Tina to the floor, you hear her screaming as he lands 3 punches. When he raises his fists, there's no blood on his fingers. Despite after he drags her into the bedroom, her nose is covered in blood.
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.