The Caped Crusader Caper - S1-E15
Audio problem: The Joker says, "It's those tiresome teenagers," but it comes out in The Penguin's voice.
The New Scooby-Doo Movies (1972)
1 audio problem in season 1 - chronological order
Starring: Don Messick, Casey Kasem, Nicole Jaffe
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!