Audio problem: Rollo's drummer establishing the tempo of the boat rowers is out of sync with the pounding of the drumbeat.
Continuity mistake: After spotting Lagertha's boats, Torvi points at the boats and lowers her pointing arm. Another shot later and she is still pointing and lowers her arm again.
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.