When Rydar is told to put his book down, he's holding it with one hand, but the subsequent close up shows him holding it with both.
In the last classroom scene, "My Hero" is written on the blackboard behind the teacher's desk. In some shots it's gone with the chalkboard completely clean.
After his time with Matt, Cole Taylor sits on the corner of his desk, but when the camera changes, he's sitting on the side edge of his desk.
Rick Donovan's lip sync doesn't match his song.