Corrected entry: When Lisa first discovers the subliminal message in the Party Posse video by playing it backwards, we hear the phrase 'Join the navy' delivered wrong because the voice we hear backwards is deeper. The tone of voice shouldn't change when audio is reversed.
Corrected entry: In this episode Dr. Hibbert says the crayon was never spotted because he always covered it with his thumb, but in episode 4-18, "So It's Come to This: A Simpson's Clip Show", when Homer is in the hospital, his head X-ray is placed up on the light box on the wall, and is visible with nothing blocking it, so the crayon should have been spotted then.
Corrected entry: All the children have time to run out of the classroom, put their coats, hats, scarves and gloves on (which are probably in their lockers) in the time it takes for Skinner to open the blind on the window. There is no way they could have done this in such a short space of time.