Continuity mistake: At the very end of the episode Clair's glass is suddenly fuller after Denise gets done singing.
The Cosby Show (1984)
1 mistake in Cliff's Birthday
Cliff: Clair, we don't even know if the joint is Theo's and you already got the boy going to Turkey.
Trivia: Nearly every sweater Bill Cosby wore on this show was sent to him by a fan.
Autumn Gifts - S4-E7
Question: When Cliff is watching TV, the sound of voices singing "Open the door and let me in." come from the television. What song is this?
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Chosen answer: That is the song "Open the Door Richard."