The chapter where Grimm meets the aetherealists. I've been rereading and I thought a few things
Folly says "He's not mad. Except that he is. And I should know" Could she be referring to the name that Bayard uses for Grimm, "Mad" (for Madison).
Do you really have peppermint candy red and white? Ours are green or green and white, which makes me think again how surprising is that even minor cultural details remain from our world to the Spire World.
Finally, Ferus mentions Grimm knows "one of" Folly's names. Do you think we will know more of her names?