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Trivia
For the entire first season, the hinges on the front door are on the right and the stairs have a corner at the bottom. However in all seasons after this, the hinges on the front door are on the left and the stairs go straight down to the floor, no corner. (Some sets do sometimes change between the pilot episode and episode 2, but I have never seen something change after a whole season.) See more...
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Plot hole: In season 9 episode 3, "A Very Brief Encounter", Ben is upset when he learns that Susan named Nick, Janey and Michael after lovers she had in university. But in season 4 episode 6, "Deliverance", there was a flashback of Nick's birth and we learned that it was Ben who named the baby. He heard someone say the word "nickname" in the delivery room and named his son after that.






