Zanna forever!
-- Graffiti (Chapter 1 paragraph Page 8)

Importance: This graffiti gives Zanna a sense that something odd is going on, something she doesn’t understand, but might be involved in nonetheless.

The rubbish was close. It had slowed, and was creeping towards them.
-- The narrator (Chapter 6 paragraph Page 28)

Importance: This takes place during Zanna and Deeba’s first moments in UnLondon, and it frightens both of them to live in a place where rubbish is animate and hungry for attention.

I conduct passengers to safety. I conduct myself with dignity. And there’s one other thing that all of us who take the oath learn to conduct.
-- Conductor Jones (Chapter 14 paragraph Page 61)

Importance: Conductor Jones says this right before he electrocutes the man who is attacking Zanna and Deeba.

Certain substances in UnLondon exist in prologue form in London, and enter a second lifecycle here with new purposes, even as sentient denizens of the abcity.
-- Mortar (Chapter 23 paragraph Page 95)

Importance: Mortar explains the rules of UnLondon to Zanna and Deeba, and this is...