What in the world was everyone thinking when they made this piece of toilet fudge? The writers actually wrote it, the network actually approved it, the cast actually got the script and said "ok yes we will do this and say these lines" and nobody on the crew or at any level ever stopped and said "you know what, this is the worst episode of any TV show ever made".....
This episode is obviously a practical joke where Roseanne deliberately made the worst possible show she could and spent all this money and laughed her way to the bank. I'm not kidding, I am 90% sure she knew the show was ending, John Goodman and other cast were leaving, all the story ideas were drying up, so she said "Screw it I'll just make one last terrible season and take my money and go home"....... think about it that's actually not a bad practical joke, spending other peoples' millions to make unwatchable TV shows, you cast people you want to meet all season (like Absolutely Fabulous, rich guests, etc), you take your money and go home and laugh about all the idiots watching your deliberately terrible show and reading the awful reviews.
That's the only explanation I can come up with. Either it's a profitable practical joke, or she only cared about the money so just made whatever crap they thought up first, or she simply went crazy years earlier than we all thought.