Trivia / Mystery Science Theater 3000 S04 E21: Monster a-Go Go

• Blooper: In the host segment where Joel and Servo play keep-away with Crow, Trace’s hand can briefly be seen when Crow suddenly jumps up after pretending he doesn’t want to play anymore.
• Corpsing:
  • Frank during the "Johnny Longtorso" song. Mind you, if the Poopie! reel is any indication, this may have been the only take that was acceptable to air.
  • Kevin Murphy can't keep it together when one of the actors imitates a ringing phone off-screen. In fairness, it is just that ridiculous.