When Homer pulls a wishbone by himself, it breaks in two places at once. That wouldn't happen. An object always succumbs to force at its weakest point and there can only be one such point.
During the flashback (which is set in 1974), the Van McCoy song "The Hustle" is played. That song was released in 1975.
When Homer was studying for his debate on the 55 mph speed limit, his response was written with his right hand. Homer is left handed.
The sign on the guidance counselor's door is for students M - Z, but the counselor says he works with students N - Z.