Corrected entry: Cliff comes down to get Theo and Elvin for dinner. He says "Are you going to come up for dinner or should I throw some raw meat down there." But then he does the reflex test and the Sondra comes down and says its time for her and Elvin to leave. So they never ate dinner, though that's why Cliff came down in the first place.
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The Cosby Show (1984)
1 corrected entry in Monster Man Huxtable
Continuity mistake: After Cliff talks to Peter, Theo is told to run to the neighbors across the street. However, he can be seen in the background of some shots when the twins do their game. As soon as the twins finish, Theo is shown coming back into the house.
Theo: You two are the most obnoxious people that I ever met.
Rudy: Thank you, your grumpiness.
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?
Chosen answer: That is the song "Open the Door Richard."
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Correction: I don't see how this is a plot hole. Maybe they just were not hungry, maybe they had other plans. Just because a visitor leaves just before a meal is served that is not a plot hole.