When Harold is arm wrestling Stinky in the lunchroom and immediately after he beats him there is a sign behind him that reads "Do Not Leave Trays Here". The rest of the lunchroom scene the sign is gone except for the very end when Harold is running out of the room in tears.
In the final round of the arm-wrestling competition, the announcer's microphone disappears.
In the final round of the arm-wrestling competition, there is a brief moment where Harold's arm has a sleeve like Arnold's shirt, and Harold's hand has Arnold's skin tone. This makes it appear as if Patty is arming wrestling Arnold rather than Harold.
