> double numbers, in addition to singular and plural (one hen, two hens, ten hens will be "[one] kura", "[two] kury", "[ten] kur")
Actually Polish does not have dual number, just singular and plural. What you are refering to is just different noun case - use plural genitive when numeral ends in 5,6,7,8,9 or multiple of 10.
That was the scene where Salander was furnishing her apartment if I remember correctly. The apartment was presented through her very technical viewpoint and IKEA catalog.
But a couple of chapters later there is a scene when Blomkvist visits the place and the description through his POV is totally different. It shows how different these two perceive the world.