Revealing mistake: At the end of the movie when the cheer squad is shooting the video with Rhianna, she is wearing a blue shirt. The shots cut back and forth between the reality of them shooting the video in front of a blue screen and what the video looks like with the effects. If Rhianna is wearing a blue shirt and is filming this on a blue screen, she would appear to have no body when no one is behind her.
Amber: We're really going to miss you, Britney. imya.
Brianna: I miss you already too.
Britney: Oh, guys, I'm gonna mysm.
Brianna: Sierra, you're not speaking IM. You're just spelling.
Sierra: Oh. Well then, S-H-I-T.