After Dorota locks Blair and Serena in a room to resolve their shit, B comes up with a dumb plan to hang out with Dan and just be friends with him. Dan, of course, hates this plan — and so does Serena, since it ends in yet more kisses. However, a UCB performance of selections from Inside finally convinces Blair that her deal with Dan is legit, and she ends the episode with a tender kiss for him.
While that part was rad — and really smartly arranged — mostly it was a pleasure to see Blair acting like herself for the first time in literal years.