Jay North reprises his role as the title character of the 1959-1963 situation comedy Dennis the Menace (1959) at Greaser's grand opening. His failure to impress Bart is a reference to Matt Groening's dislike of the TV show which was actually Groening's inspiration for creating the character of Bart Simpson first intended to be a "harder version" of Dennis Mitchell.
When the gang is saying goodbye to Marge, Ramrod (voiced by Henry Winkler) calls her "Mrs. S". Winkler most famously portrayed Fonzie on Happy Days where he often referred to Mrs. Cunningham as "Mrs. C".
Blackboard: "I can't see dead people".
Henry Winkler (Ramrod) and Julie Kavner (Marge Simpson) played husband and wife 7 years later in Click (2006).