In the scene where Brittney is talking to Adrian at the pool asking her to go out dancing with her that night, all of Adrian's hair is up in a clip. A few minutes later she's cleaning leaves out of the pool and her hair is down. Then she goes down in a basement to do something and when she comes back up the stairs her hair is pulled back up in the clip. Her hair actually changes styles three times in this scene. It's a pretty easy slip-up to see. Enjoy!