Continuity mistake: When Fred tells Wilma that he is giving up inventing for good at the end of the episode, you can see that Betty is sitting next to Wilma on the couch. When we see a close-up of Fred in the next shot, Betty is missing.
Dr. Sinister - S5-E8
Continuity mistake: When the aeroplane arrives at Dr Sinister's volcano, Fred and Barney are led down the stairs by the three crooks, but when they arrive at the sliding door, one of the crooks has gone.
Continuity mistake: Wilma opens the bedroom door to find Fred covered in flour, but in the next shot the bedroom door has vanished while Fred stands in the doorway.
Super Grover
Fred Flintstone: I love my dear sweet mother in-law. My mother in-law is a doll.
Attendant: Are you feeling all right, mister?
Fred Flintstone: Huh? Yeah. Yeah, I'm okay.
Attendant: Good. Good. You just stay in here and rest. That hot sun out there is a killer.
Fred Flintstone: Poor guy, he must have been standing in it for hours.
Trivia: The show's original title was "The Flagstones.".
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