Audio problem: Rollo's drummer establishing the tempo of the boat rowers is out of sync with the pounding of the drumbeat.
Vikings (2013)
1 audio problem in season 4
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.
Bjorn: What are you so afraid of? It's only death.