When Queen Bee and her gang are captured, they are put into the back of the van without handcuffs and the academy rookies rush to the graduation.
When they arrive and open the van to show everyone who they captured, Queen Bee and her gang are all wearing handcuffs.
In the bathroom scene, after they secretly place a sign on Holly's back, she "leaves" the room, but she never actually leaves the room - she just stops & stands in the corner.