Continuity mistake: 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 mistake: When 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. Same thing with their mugs.