Other mistake: The outside shots show that the house is in the middle of a row of houses, connected to other houses on both sides. But in the living room, behind the stairs, is a window looking outside. There couldn't possibly be a window there as that is where the house shares a wall with the house next door.
The Cosby Show (1984)
1 other mistake in show generally - chronological order
Audio problem: When Cliff asks Rudy what's her boyfriend's name, you can hear a man off-camera saying "Bud" before Rudy answers.
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."