A lot. And I’m grateful for your concern. But I mustn’t wake up, you know?
-- Harry (Chapter 9)

Importance: Nina, a waitress at Schrøder’s Restaurant, reminds Harry how long it has been since he has been drunk. He tells her that at this point it is more important for him to stay asleep and not acknowledge that Rakel is dead than it is for his to maintain his sobriety.

Yes,’ Katrine said with a nod. ‘There’s evidence of someone removing the evidence. Someone who knows what evidence he needs to remove.
-- Katrine (Chapter 9)

Importance: Katrine indicates to Harry that someone who knew about police investigations and crime cleaned up Rakel’s murder scene well enough that the police were not able to get a good deal of evidence. This suggests that it was someone in law enforcement or a related field who killed Rakel.

My son was murdered by a policeman. Now...
-- Finne (Chapter 9)