Continuity mistake: When Fred and Barney are singing "Old MacDonald" with the international scouts, the groups' signs aren't consistent. At first, they have the names of the countries, but later on they have the names of the languages.
Continuity mistake: While Fred and Barney are fighting, when Pebbles and Bamm-Bamm are devising a plan together in baby-talk, the black strap is over Bamm-Bamm's left shoulder, but when Bamm-Bamm walks past Fred and Barney the strap is over Bamm-Bamm's right shoulder. (00:22:55)
Answer: The ratings had declined in its last few seasons, and the series was cancelled.
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