* AccidentalInnuendo: English speakers may have to be forgiven for initially assuming these books are satirical or even pornographic based on the name of the protagonist. It ''really'' doesn't help that the ''[[Film/TheSnowman2017 Snowman]]'' film actually pronounces it as "hole" rather than the proper "ho-lay."
* CriticalResearchFailure: A plot point in ''The Redbreast'' involves Svarre Olsen on trial in South Africa and threatened with execution, and at the end [[spoiler:he is sentenced to death]]. The problem is that South Africa had abolished the death penalty well before 2000, when the novel takes place.
* GrowingTheBeard: ''The Bat'' and ''Cockroaches'' are not particularly highly regarded, as they suffer from a great deal of EarlyInstallmentWeirdness and Jo Nesbo was still finding his feet as a writer. It is the third book, ''The Redbreast'' where Nesbo truly comes into his own as a writer, and the series vastly improves in quality from there.
* IronWoobie: Harry, big time -- especially in the last few books.