This thread is like 2 months old and I'm rewatching the episodes of the threads I missed on, so let's go through this via screenshots.

I'm pretty convinced this toilet sign is Ougi and Nadeko. I think it's easy to forgot that Ougi is a boy now.

We finally got the opening for Nademonogatari which features both Kana Hanazawa and Saori Hayami. I don't know if Nademonogatari is the first time I've heard the two together. Both their voices share this characteristic I can't describe in English but when you hear it, you might get what I mean.

I'm certain this is a callback to an older scene in the series. Either Koyomi or Ougi meeting with Tsukihi. You can also say Akira if you'd like.

Marina Inoue sounded completey different here, obviously because this isn't the same Sodachi we knew. She's a lot more compassionate and sister-like to Nadeko. I didn't even recognize her until Nadeko said so herself. I'm actually quite glad Sodachi is doing better here and didn't turn out to be a one-off character in the series (as she kind of came out of nowhere previously).

There really is something about girls cutting their hair short when they want to change something about themselves. It's a really interesting phenomenon that boys don't really have an equivalent to. More interestingly I guess, this scene parallels with Hitagi and Koyomi during Mayoi Snail.

By far the shots that reminded me that Monogatari is "peak cinema", as they say. Live action shots, somewhat reminscent of early 2000s handhelds composited with a running topless Nadeko.