Jack says, about an hour into the movie, "you don't buy her Suzy Creamcheese act, do you" refers to a character created by Frank Zappa, whose music screenwriter Billy Bob Thornton is a fan of. Suzy appears as a character on the Zappa albums Freak Out!, Absolutely Free (which contains a song called "Son of Suzy Creamcheese") and Uncle Meat.
When Marty freaks out about the scorpion, Cindy says, "It's just an insect." Actually, scorpions are arachnids.