The 50s should probably annoy you as well then because I think the '50s episode' was based off the Dick van Dyke show which didn't air until the early 60s.BTW I was serious when I suggested updating the thread title. We skipped the 90s. It's bugging me!
I mean, ultimately something can come out in 2000 or 1961 and still feel like it has the aesthetics of the decade prior. 1998 and 2000 probably have more stylistically and culturally in similar than 1991 and 1998 or 2007 and 2000 so I just wouldn't worry about it. It may literally be one way or the other but I'd wager early Malcolm in the Middle and the last episode of this are probably '90s' enough for most people.