I'm skipping through it. I really couldn't care less for the Noe x Vanitas melodrama.
Going by the ending of this episode I presume their relationship will FINALLY progress (but I already thought that would happen with the bell tower scene of episode 6 and that went nowhere) and the manga's story will also go into new territory (whenever that might be looking at the time between chapters).
Episode 23 covered chapter 53 completely. 2 (or 3 with the one they released this week) chapters remaining for the last episode. They really completely caught up to the manga with this cour.
As for music, they've been muting layers of BGMs from the start and it's nothing surprising. Only the merry go round track is not on the OST.
BTW, I've been listening to the OST again the last couple of days and I gotta repeat myself - we blessed, lol.