Here are some Goofs that should be added:
1. Fosse McDonald's voice is heard in class when he says "That's gay!", but he is nowhere to be seen in class. 2. Before the class walks into the auditorium, Kevin Stoley can already be seen seated, yet he is seen walking into the auditorium with class, thus meaning there are two Kevin Stoleys at the assembly. 3. The scene where Conan O'Brien jumps out the window to his death is visible on TV even though Talk Show sets never take place outside. 4. Kenny was still alive (albeit briefly) after his heart was disemboweled and replaced with a baked potato.