Continuity mistake: Cliff says "a young trumpet player while sitting in the bandstand watching the dancers". But in all the later episodes, Russell plays the trombone, and he had been for a long time.
The Cosby Show (1984)
1 mistake in Happy Anniversary - chronological order
Theo: You two are the most obnoxious people that I ever met.
Rudy: Thank you, your grumpiness.
Trivia: This is the first appearance of Sondra, the eldest of the five Huxtable children. Sabrina LeBeauf, who plays Sondra, beat out future pop star Whitney Houston for the role.
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."