Continuity mistake: Valerie wears purple shoes throughout the episode, but in one scene, she is wearing black shoes.
Continuity mistake: When Batman and Robin guest star on the show, Batman's cowl changes from covering his neck to exposing his neck.
Shaggy: Man, I don't know what's worse... Those Muck Men, or Cass Elliot's driving.
Scooby: Cass Elliot's driving!