Continuity mistake: Throughout the first season, Fred and Barney's boss' name changes from George Slate to George Granite and back.
Continuity mistake: When Barney puts down the telephone and says "Could it be Fred Flintstone after all these years?", the receiver vanishes shortly before the scene changes.
Continuity mistake: The cake in this episode is first called "Upside Down Flint Rubble Bubble Cake." Later in the episode, it's suddenly called "Upside Down Flint Rubble DOUBLE Bubble Cake."
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.
Answer: The ratings had declined in its last few seasons, and the series was cancelled.
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