Trivia: In the Season 7 episode, "White Men Can't Kiss," D.J. refuses to kiss a student named Geena Williams in a school play because she is black. In Season 10, it's revealed that D.J. is married to that same girl.
Two for One - S7-E2
Trivia: At the end of the episode Nine Is Enough there is a scene making a joke out of Dan being in shock about Roseanne being pregnant. In that scene they show Roseanne in the future with a pregnant belly wearing a maternity dress. In the very next episode, Two for One, she is in a maternity shop trying on that very same dress.
Answer: Clearly, the only person who could truly answer this question would be a set designer for the series, or someone else directly connected to the series who would have this kind of detailed information. I looked on IMDb.com and Cheryl Lanner is credited as set designer through 1997. I quickly found her Facebook page, and I directed your question to her. After some time, Ms. Lanner has replied as follows: "I decorated the last season 1/2 but after 9 seasons the sofa just plain got worn out and had to be repaired from 8 years of usage. There was a board put on the sofa but as I've said, it was due to so much usage. If they had back problems I was unaware of them, but you can be assured that if that was the problem it would have been fixed immediately. Take care Michael!"
Michael Albert