The Cosby Show

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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.

Show generally

Revealing mistake: Everytime someone opens the front door to go outside there is just steps leading outside, but when they are on the steps outside and the doors to the inside are open there is a wall and a table with a lamp. Inside that is not there.

Pilot - S1-E1

Deliberate mistake: In the very first episode, the kids are fighting and arguing all throughout the house. Claire then asks Cliff, "Why did we have 4 kids?", referring to Denise, Theo, Rudy, and Vanessa. In all of the following episodes, they actually have 5 kids. I guess they decided to add Sandra (the oldest Huxtable) later down the road.

Pilot - S1-E1

Continuity mistake: The father was known as Clifford in the beginning but the name was changed to Heathcliff (you can see this on the nameplate for his office).

Pilot - S1-E1

Continuity mistake: After Theo gives up an extra $100 for clothes, he is holding $300 left in his hand. However when the camera switches back to Cliff, who asks how much is left, it switches back to Theo, who is only holding $200 left.

mirtom

Clair's Case - S1-E19

Continuity mistake: The amount of water in Clair's cup changes a couple of times, most noticeably after Cliff tells her what she is eating, she takes a drink and the cup is about 1/3 full. She gets up to go find Theo, and now there is very little water in the glass.

Bowling255

Slumber Party - S1-E22

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.

Slumber Party - S1-E22

Other mistake: During the scene where the twin sisters were singing their song, Theo was asked by Cliff to go to Peter's house and ask his mother if he could stay. Theo left immediately after this. But if you look closely while the twins are singing, you'll see Theo's arm in the scene. When the twins finish performing, they sit down. After this, you see Theo coming through the door after having just gone to Peter's house.

mirtom

Happy Anniversary - S2-E3

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.

Rudy Suits Up - S2-E7

Factual error: When Clair and Denise are watching the Bears vs. the Giants game, they comment on how cute player number 16 is. In 1985, nobody wore 16 for either the Bears or the Giants. Former Bears' placekicker Bob Thomas wore it from 1975 to 1984 until he retired. 16 wasn't worn again by the Bears until Tim Lashar, another kicker, wore it in 1987. Also, 16 had long since been retired by the Giants. It was last worn by Frank Gifford.

mirtom

Cliff: Clair, we don't even know if the joint is Theo's and you already got the boy going to Turkey.

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Chosen answer: That is the song "Open the Door Richard."

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