Revealing mistake: Even though the Vikings are rowing their boats at full speed, there are no wakes from the aft nor waves from the bows as the boats plow through the water.
Vikings (2013)
1 revealing mistake in Death All 'Round - chronological order
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.