Blackboard: "Fish do not like coffee."
Couch: In a parody of the opening of the 1960s sitcom, Get Smart, Homer goes through many futuristic doors and passageways until he reaches the phone booth, falls through the floor, and lands on the couch (with the rest of the family already seated).
In Bart's daydream, the characters sing the classic Jewish folk song Hava Nagila.
Among characters that Bart imagined during the test was Bender from Futurama. Matt Groening is co-creator of the show.
On the field trip memorial wall when Willie has to enter Bart and Lisa's names, you'll notice two particular names. El Jefe (Hefe) and Fat Mike - horns/guitar/backup vocals and bass/lead vocals/founding member (respectively) of the punk band NOFX.