When Nadine is having lunch in Mr. Bruner's room, she moves trays on his desk to prop her feet up. When she gets up to get her lunch to leave the room, the trays have returned to their original positions.
When Nadine is eating her lunch in Mr. Bruner's classroom and talking to him, the Coke bottle on her desk keeps turning between cuts without her touching it.
When Krista and Darian were cleaning up the kitchen, the bin changed places multiple times.
On the morning of the film festival, an exterior shot shows only Nadine's mother's car in the driveway. When Nadine comes downstairs, Darian and Krista are there, despite Darian's car not being in the driveway.
When Nadine is having lunch with Mr Bruner (at around the 50 minute mark) Mr Bruner puts his notepad and pencil down on his desk with the notepad closed and the pencil directly on top of it. In the several shots following this, the notepad constantly changes between being open and closed and the pencil constantly changes position.