Continuity mistake: When Wilma is scrubbing the deck on Columbus' boat, you can see she has Betty working beside her, but after Barney asks "A mutiny?" we cut back to Wilma and Betty has vanished.
Continuity mistake: During the jousting scene, the King and Queen keep changing positions from standing up to sitting down on their thrones between shots.
Continuity mistake: When Fred wins the jousting competition, the King tells him that he has won his daughter, Princess Lenor, but in the next shot when Fred asks, "What do you mean, I've won her?" Lenor has suddenly disappeared.
Continuity mistake: When we see the dial on the Time Machine, it initially has six segments, but when we see a close up of the Time Machine inventor putting his hand on the dial, it has now has seven segments.
Continuity mistake: When Fred and Barney rush off to have a go on the shooting gallery, Wilma's eyebrows disappear but then re-appear when Betty says "Aren't they cute?".
Continuity mistake: When we see Wilma speaking in Fred's car at the start of the episode, the hole behind her changes from small to large between shots.
Continuity mistake: At the end of the episode, watch the colour of the time-machine inventor's outfit. You can see it's light blue when he pulls the lever, but when he gets the Flintstones and Rubbles back to the fair and asks them what happened, his outfit is a darker shade of blue. It then changes back to its lighter shade as before.
Continuity mistake: Towards the end of the episode when the time-machine inventor pulls the lever on the machine, three lemons appear and he says "Wow, Jackpot!". But in the next shot, when the Flintstones and Rubbles run out of the machine, the lemons have vanished.
Continuity mistake: When Fred pays the man at the hamburger stall 'two rocks', he places the money on the counter. When we see a close up of the money, one rock is behind the other one, but in the very next shot the two rocks are now lying side by side.
Continuity mistake: When the man at the hamburger stall gives Fred his 'brontosaurus burgers', he serves them on a tray, but just a few shots later the tray is nowhere to seen.
Answer: The ratings had declined in its last few seasons, and the series was cancelled.
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