Bart's middle name is JoJo

All characters in the Simpsons are shown to have four fingers except one who has five: God

The two alien characters in the Simpsons are named after a Klingon warrior and "Kodos the Executioner" in the original Star Trek series

Highlighting his dictatorial proclivities, Milhouse's full name is Milhouse Mussolini Van Houten

Krusty the Clown was originally intended to be Homer's secret identity