
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.

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.
Answer: The ratings had declined in its last few seasons, and the series was cancelled.
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