Seems like they used Danish actors for most of the Danes, it's quite jarring to listen to their pronunciation for me as a Dane, but I guess it's kind of cool. The thing that's disturbing me most about it at the moment is the costume design (including weapons and shields); how hard can it be to get it right? Why do we need silly looking, studded, non-practical leather armour, square shields, and weird, gilded, browed helmets?