When Marco ilsø (Hvitserk) and Alex Høgh Andersen (Ivar) were cast in the series they weren't allowed to tell anyone, so they wrote to each other that they didn't get the role. See more

Goofs

Borg is portrayed as being seen as unstable by his peers for communicating and asking the skull of his dead wife for advise. But in pre-christian Scandinavia, there was an extensive cult of the dead and communicating with the dead and even interacting with them was common. Modern ethnic groups like the Torajan people still has such practices. There are even myths of Odin communicating with the head of his dead teacher, Mimir, so Borg's action would not have been seen a deviant behaviour by Norse pagans. See more