The holes in Marge's hair while she's in the doctor's office.
Bart throws the same cupcake onto the wall in two separate shots.
On Krusty's Komedy Klassic, former President Ford states that the Boy Scouts of America has been shaping young men for over 100 years. The BSA was formed in 1910, only 87 years before this airing. However, this may be a subtle joke about the real Gerald Ford's propensity for getting facts and numbers wrong.
In the wide shot or Chief Wiggum resting on the park bench, Snake Jailbird can be seen in the background with blue hair.
The alleged clip from The Andy Griffith Show (1960) involves both Barney Fife and Emmett's Fix-It Shop. Emmett entered the show after Barney had left.
Shary sings that Barney is "flat on his face." On the contrary, he is supine.