Character mistake: After Jack (who's hiding from Chrissy's mother) ducks behind the couch holding a mop, Chrissy's mother comes out of the bathroom (which from the camera angle shown is in a straight line facing the back of the couch where Jack is) and walks to the right and all the way around the couch and sees the mop behind the couch and picks it up without seeing Jack at all. From where the bathroom is, she would have just needed to walk straight for the mop and seen Jack (yet she missed him).

Three's Company (1977)
1 mistake in And Mother Makes Four
Starring: John Ritter, Don Knotts, Suzanne Somers, Joyce DeWitt, Richard Kline
Genres: Comedy
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.
Trivia: Of all 5 roommates (Jack, Janet, Chrissy, Cindy, Terri), the only parent of a roommate never to appear in any episode is Cindy's mother.
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".