Other mistake: On the first day of the Big Bounce, during the dancing, a white towel-like object is dropped on the floor and in the next shot it is gone.
Other mistake: During the Second Day of the Big Bounce, as Lil' Kim is announcing that there are no rules and the music will run for five minutes and she will yell stop, she actually never yells stop at the end of the five minutes.
Answer: When Dave's crew went to the finals they wanted to bring the best dancers in their group, so they apparently decided that the two girls happened to be the least strong dancing wise on his team.