6. That creepy guy with the mustache who goes yessssssssssss is a caricature of the late character actor Frank Nelson, who used the inflected yesssssssss as his catchphrase on I Love Lucy, The Jack Benny Program and Sanford and Son.
7. Matt Groenings last name is pronounced Gray-ning, not Grow-ning.
8. Dustin Hoffman guest-starred on the show as the inspirational substitute teacher Mr. Bergstorm in Lisas Substitute in Season 2, but because of contractual obligations he could not use his real name and was instead credited as Sam Etic (a play on Semitic).
9. Also because of contractual obligations, Michael Jackson, who supplied the voice of mental patient Leon Kompowski in Stark Raving Dad, was credited as John Jay Smith.