Continuity: Near the end of the movie, when Parker and Hunt are on the bus going to the contest, you'll see that Parker's hair is in waves.  But when she arrives at the studio, her hair is VERY curly. Its not likely that she had time to change her hairstyle THAT drastically if she was pressed for time as she very clearly was.

Continuity: In the scene where Jeff and his father are talking at the dinner table and his father is convincing him to be in the contest, each time the camera cuts to either one of them the sugar bowl on the table either has the lid off, or on. It changes every cut.

Visible crew/equipment: Sarah Jessica Parker is supposedly alone in the bathroom having a soak. Someone shouts that there's a phone call for her, and you can clearly see one of the film crew's head in the shot.

Continuity: During the dance contest near the end, Sarah Jessica Parker is wearing a pink shirt that is off one shoulder. If you watch the shirt switches from one side to the other several times.

Continuity: In the audition for "Dance TV" after Helen Hunt's character has been cut, she moves behind the other auditioners to argue with her dance partner. Kneeling in front of her, beside a girl in a pink leotard, is supposed to be Lee Montgomery, but his stand in's face is visible throughout the scene, right up until his close-up, before he stands up.

Continuity: Near the end of the movie, when the girls are trying to get to the dance contest, they are running through traffic, on top of cars, etc. Janie's hair changes with each shot. Sometimes it's up in a clip, other times, it's down. Plus, it's either really frizzy in one shot or kind of curly in others. Her hair changes drastically with every shot. Pretty funny.