The Walsh House was retconned more times than Valerie's Dead Dad. Per my recollection, at the end of season 1 when they were going to move back to Minneapolis, it was mentioned that Jim's COMPANY owned the house, it was like, leased by his firm for them for some reason. Then when they moved to Hong Kong, it was retconned that they owned the house and were going to sell, and the gang threw a huge party to trash the joint because the seller planned to tear it down. But that fell through.
Then the gang just lived there for the rest of college, which at least makes a small amount of sense. Post-college everyone just sort of rotated in an out of living there and it eventually became Janet and Steve's house with the baby? Did they buy it from the Walshes? Did they pay rent? WHO KNOWS!?
And don't get me started on everyone's finances. HOW did Kelly and Donna just start up a boutique at age 23 with no money or business experience whatsoever? How did Kelly's fucking psych degree prepare her for this? Or for her future career in "public relations" (in quotes because it has as much to do with actual PR as Samantha on S&TC)?
I feel like the retcons only get worse from here on out. Don't forget Dylan comes back as a heroin junkie, which everyone is so concerned about they forget all about his alcoholism, which was the dominant storyline of his first 5 seasons on the show. I remember scenes of him just hanging out drinking casual beers with Steve and David and wanting to scream at the TV.