Revealing mistake: During Jack's dance scene, the old lady that he dances with spins away from him and knocks off a man's toupee. The actress was supposed to knock it off as she went by, but it's obvious that she misses and instead quickly reaches over to snatch it off his head instead.

Three's Company (1977)
1 revealing mistake in Up in the Air
Starring: John Ritter, Don Knotts, Suzanne Somers, Joyce DeWitt, Richard Kline
Genres: Comedy

She Loves Me, She Loves Me Not - S8-E2
Visible crew/equipment: After Jack talks to Larry about the magazine quiz Jack asks Janet if anything's been bothering her, and just as Terri walks out of the kitchen holding the two cans, a crew member's hand can be seen behind Terri placing a bag on the counter. (00:04:15)
Stanley Roper: I want my rent.
Helen Roper: Stanley, where are your manners? You're supposed to say hello when you walk into a room.
Stanley Roper: Hello, I want my rent.
An Anniversary Surprise - S3-E20
Trivia: Many TV stations over the years left out the original ending scene (the small party held before the Ropers leave). This scene explains how The New Landlord Mr. Furley knew Jack was supposedly gay in the first episode without anyone mentioning it. This ending reveals Roper told the new owners Jack was gay. Without seeing this ending, the storyline is unclear.
Question: What is the picture of women on the walls of the set? Not the butterfly picture, the others.
Answer: Or, you may be referring to Tranquillo Cremona's High Life (A Piquant Conversation), which hangs above the side table.
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Answer: I believe you are referring to the artwork of Alphonse Mucha. On the wall next to the front door was "Feather" (which is one half of "Primrose and Feather"). Above the telephone in early episodes was "Zodiac". Also seen through The Apartment was "Spring" and "Autumn".