I've said it before (and I believe Drtooth has too), but that's a drawback to producing seasons so far in advance (and for a while there, they were doing two seasons in advance), by the time they make it to air, the references are a tad dated.
The episode that was an obvious parody of the band ***** aired well after they broke up and were culturally irrelevant. And it wasn't even a close parody. It was one of those really loose "we're still relevant, darnit" ones that had nothing to do with *****. I mean, they didn't play instruments and the plotline was about how they needed instruments... really didn't bother researching anything with that one. And there's no excuse. There's the internet.
And then there's the point where they got
really desperate about their parody segments in recent years. They made fun of "the girl scouts
and their cookies" and the game Simon Sez and were
proud of that. Then there's the whole bit about Everyday Magic being a parody of "Pippin" (which enjoyed a revival about a year before the episode aired), except it wasn't and had nothing to do with anything. I really feel that the satirical pieces were the show's burden. They only mention one this year, an Orange is the new Snack parody. That screams "in name only" considering the subject matter. I'd say the bigger problem is celebrity guests. Didn't the lead of One Direction leave shortly after "That's what makes U Useful," if not before?