When Andrea and Sue are standing in the hallway, discussing having liked their teachers, you see Sue with her school book above her notebook. In the next shot, it is below it and the notebook is flipped.
When Sue walks in on her mother in Scott's room, Mrs. Scanlon is placing a picture frame on Scott's dresser. The camera shows a picture of David and Scott but when you see Mrs. Scanlon placing it from afar, it is a picture of the group together.