The lyrics apply equally to Blair and to Vanessa ("I've got a man who's always late/ Any time we have a date/ But I love him.../ And I'm gonna have him...") whenever the van der Bilts are involved, but of course here it's a way of having old people music and eating our cake too, in not being driven crazy by actual old people music, and a way of illustrating the creaking inability of our generation to get it together for the silly shit our grandparents think is important, in enough time to understand why.
Nate's still checked out, but treating her well. She tells him not to bother his grandfather with Columbia talk, and he shoves past Granderbilt, promising he won't talk to William about that, or anything else for that matter. "Is there a problem, Blair?" She fairly salutes, shooting William a reassuring smile, grabbing a champagne glass, and launching herself after him. If she's got the family all she needs is Nate, and she's had him forever.
Lily and Rufus randomly show up for the Seder at Eleanor's, so that Lily can pimp Rufus to rich people who like to buy art, without of course telling him about it because he's Rufus, he'd find a way to object, and Eleanor thanks her for inviting herself, mentioning once again that Cyrus's mother hates her. "Another friendly face is always welcome," she says, and turns a mutually not-so-friendly smile to the very wary Rufus, blowing him a hilariously disinterested kiss and prancing past his offered coat. She almost tells him that his son is a servant at dinner, but takes her tiny revenge at the last second. I'd be wondering if he had any other kids I could buy at some point. How awesome would it be if Pilot Inspektor turned out to somehow end up employed by Eleanor Waldorf?
Rufus, of course, knows and hates the rich-people art collectors on sight (one of them apparently "put a Monet in his bathroom"), which is ridiculous because he's always sold to rich people, it's how he hooked up with both Bex and Lily in the first place, but whatever. Dan runs down the stairs and sees them, and panics, but Serena appears and says -- I guess coming off that last scene a while back -- that he's with her. Lily's none too happy to see grounded Serena running around the Waldorf apartment, but Serena apologizes immediately and says she was invited, and then invited Dan. Even though they all know that Blair's not there and isn't coming. I don't know, this middle part seems more complicated than it needs to be, just so we'll feel like it's very complicated, or else this is just the one scene where the seams are showing in order to pull off everything else.