At the end of the movie, while everyone is singing 'all in this together' they do the wildcat dance.

if you look in hte background on hte raised seats (where the crowd sits during a basketball game) everyone on those seats (except the band) joins in with this part of the dance.

look on the first row, about four or five people from he edge of the screen, there is a cheerleader doing this dance. However, she is wearing the opposite teams uniform, therefore she is from another school, and that means she shouldnt know the dance.