Continuity mistake: When Fred drives his car the wrong way during the race, there is an "8" on the back of the car when he squeezes his way through two cars, but in the next shot the "8" has disappeared.
Continuity mistake: When Barney, Betty, Wilma, Bamm-Bamm and Pebbles are on the bridge at the end of the episode, Bamm-Bamm's white hair turns red like Pebbles', then changes back to white when they all start laughing.
Continuity mistake: When Fred introduces Wilma's book to Barney, the book is red, but when Wilma is reading the book in bed later, the colour is now green.
Monster Fred - S5-E2
Continuity mistake: When the doctor puts Fred into the trick box you can see that the box is quite small, but after a quick cut to Barney we return to the doctor and the box is much longer.
Continuity mistake: When Fred is reading his letter about his position being accepted at the Stone Valley Inn, you can see Wilma is sitting in the chair next to him, but in the next shot the chair is empty and Wilma is nowhere to be seen, then she reappears in the chair.
Superstone - S5-E24
Continuity mistake: When the host tells the audience that Superstone (Fred) will demonstrate his strength at the Bedrock Theatre, the barbell in front of Superstone's feet changes position between shots.
Superstone - S5-E24
Continuity mistake: When the woman in the episode on TV says "Farewell, Superstone!", Superstone replies, "Bee-Hee-Hee-Ho-Ho!" and you can see that he has a yellow triangle on his suit, but in the next shot when he flies out of the window, the triangle has disappeared.
Superstone - S5-E24
Continuity mistake: When Fred, Barney, Pebbles, Bamm-Bamm, Dino and Hoppy are watching "Superstone" on the TV, you can see that Pebbles and Bamm-Bamm are right in front of Barney, but in the close-up of the two, Barney is nowhere in sight.
Continuity mistake: When Fred and Barney are fighting over the television there are three knobs on the TV set, but when Wilma starts talking to Fred they have vanished, then they reappear.
Continuity mistake: When Fred and family start their drive toward Jellyrock Park, the trailer has one window and a door on its right side (behind Wilma's side of the car), but when they reach Jellyrock that side of the trailer now has two windows and the door is gone. (00:11:50)
Continuity mistake: Fred is on a ladder lighting a candle - the top legs of the ladder are rounded. He falls from the ladder. The top legs are now square. (00:07:15)
Continuity mistake: While sitting down at the celebration dinner, Wilma has a blue dress and Betty has a white dress. When they get up and walk away from the table, they've swapped colours.
Continuity mistake: When Fred and Barney are driving their car through the One-Way tunnel, the edge around the hole at the back of their car is smooth, but when Barney turns right to go through a tunnel, the edge is now torn.
Continuity mistake: When Fred and Barney discover that the football match on TV has been postponed, we see an interviewer sitting at the desk and you can see there is a nameplate saying "T.V." in front of him, but when the interviewer introduces Eppy Brianstone in the next shot, the nameplate has disappeared.
Continuity mistake: When Fred carries a plate of sandwiches to watch the football on TV, the TV channel knob has nothing around it, but when Fred switches on the TV to watch the football, there are now dots around the knob.
Continuity mistake: When we first see the Flintstones' house at the beginning of the episode, the handle is on the left-hand side of the door, but when Dino walks out of the house after Fred tells him to play outside, the handle is now on the right-hand side.
Continuity mistake: When Fred and Barney arrive at the Rockland Club, they park their car right in front of the front door. When Betty and Wilma arrive, they park their car in front of the door and Fred and Barney's car has disappeared.
Continuity mistake: When Barney asks Fred if he could have 25 cents for a sandwich whilst practising their ventriloquism act for "The Ed Sullystone Show", you can see Barney has his left arm on his knee, but when we see a close-up of Fred in the next shot, Barney's left arm is missing.
Continuity mistake: When Barney shows Fred the ad in the paper about new novelty acts for "The Ed Sullystone Show", the ad says "Apply Bedrock Broadcasting Co" at the bottom. When we see Fred and Barney in the queue with the other applicants, the station is now called "Bedrock Television Company."
Continuity mistake: When Fred stands on the scales, he is holding a dish containing the reducing formula and there are bubbles coming out of it. In the next shot, there are no bubbles to be seen, but in the next shot, they are back again.
Answer: The ratings had declined in its last few seasons, and the series was cancelled.
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