Continuity mistake: When the real 'manager' comes outside to yell at "Mr. O'Donnell', you see the manager walk back into the club. If you look in the background of the next shot, you can see the manager walking through the door again. (00:13:25)
Continuity mistake: Toward the end, Russell goes to talk to William at his house. He turns the chair around to sit on it backwards, and throws the shirt down onto the ground. When he sits down the shirt is back on the chair.
Continuity mistake: In one scene when Cooper is choreographing the dance, his shirt is sweat-free. The next time you see him there's a big sweat stain on his shirt. (01:05:10)
Continuity mistake: There are seven Wharvey Gals. Three on the stage singing, three with the wife, and one that she's holding. One of the girls even says that there are seven of them. Yet in the end, when Everett and his wife are walking down the street, there are only six. One that she is carrying, and five following.
Continuity mistake: In the scene where Lucy sang and won the $500 competition, when they are announcing she's the winner they show a far away picture, and Lucy has the money in her hand. Then they show a close up picture, and Lucy doesn't have the money - the announcer does, and then hands it to Lucy.
Continuity mistake: When Kevin and Perry are DJing in Kevin's room, there is a green lava lamp in front of the decks. In one shot the lava lamp is switched off, and in the next shot the lava lamp is switched on, and in the next shot it is switched back off again. (00:21:05)
Continuity mistake: When John Cusack is at a house after the funeral, he is standing in front of a fireplace. You can see the boom microphone dip into the top of the screen above his head.
Continuity mistake: When Micky is talking to the guy outside the audition room, he has a red book and pencil with him. When he goes into the audition room, the book has disappeared.