* FridgeBrilliance: Bellis feels that if Possibility Theory is correct then that invalidates [[Literature/PerdidoStreetStation Crisis Theory]]. However, the audience who read ''Literature/PerdidoStreetStation'' know that a working Crisis engine can exist, and in this book, we also see that Possibility theory works. The brilliance comes when you realize that both theories allow for the other to exist. Possibility means implicitly the possibility where Crisis is correct, and Crisis is built on a dialectical competition of forces until one succeeds over the other. In other words, the very existence of possibility begets crisis.
* FridgeLogic: The question of where Armada gets its fresh water is never addressed. The scarcity of drinkable water on the ''Therpsichora'' is mentioned early on, but there's no indication that Armadans use desalination techniques, or even set out catch-basins during rainstorms.
* HoYay: There was a mix of this and FoeYay between Uther Doul and the Brucolac. Mostly from the Brucolac's side. He very explicitly wonders whether Uther is a masochist, and then acts like a scorned lover through most of the novel. There's also the matter of what exactly their history together is. This pairing isn't invalidated by the ending, either.
* MagnificentBastard: Arguably Uther Doul, The Brucolac, and Silas Fennec.
* OffscreenMomentOfAwesome: The book's largely about a narrator 'lost at sea' in a city that's often outside the bounds of her knowledge and understanding. The story builds up a rivalry - and an intriguing past acquaintanceship - between two overpowered badasses, and they finally get their showdown a couple of chapters from the end... but then the fight scene gets skipped entirely, and instead we get to see the aftermath at the start of the next chapter.