FOX (ended 2006)
that doesnt make sense, wasnt the christmas of '79 in season 7? Thats a huge mistake if the want to do a new years episode in like the last episode, okay now it bugs me now that i have thought about it
So basically, all the stuff that happened in between is what happened all in one month, which is pretty believable
Well, clearly the show was written by postmodernists who believe all time is relative & not linear.
Hey, it's a sitcom, you gotta roll with it. I've noticed other incontinuities (songs played that weren't released until the early '80s, clothing that wasn't popular until the early '80s). But what the heck, it's a great show w/great actors & writing, so you have to cut some slack.
I guess that it had been a major concern among the creators, but they had to make a decision: Keep the characters 'lagging back in time', or end it while it's so popular, successful, and full of many more brilliant ideas.
I don't think that any of us would have liked it, if it all ended 4 years ago.
So instead of jumping to immediatelly judge the people who created this magnificent sitcom, my opinion is to try to be a little more rational about the situation, and a little less doubtful of their professionalism.