Revealing mistake: The battle has Lagertha fighting skeletons, but on her final skeleton she swings her sword downwards and massively misses it by a large margin, but it still falls.
The Message - S5-E7
Revealing mistake: When Floki and fellow Vikings march across Iceland, an aerial view of Dettifoss waterfall is shown, including the visible tourist paths, fencing and a small stone bridge on the left, used by tourists to visit around the site. (00:31:15)
Factual error: The snakes in the King of England's pit are all constrictors. They do not have venom and are too small to see a human as prey, yet they show a man dying from a bite by one of these snakes.
Ragnar Lothbrok: So have you returned to your faith, renounced ours?
Athelstan: I wish it was so simple. In the gentle fall of rain from Heaven I hear my God. But in the thunder I still hear Thor. That is my agony.
Ragnar Lothbrok: I hope that some day our Gods can become friends.