The Vision - S4-E12
Continuity mistake: Shots from inside the boat show all 3 boats without sails, but aerial views and shots from behind the boats shows them with sails. (00:36:30 - 00:38:40)
Audio problem: Rollo's drummer establishing the tempo of the boat rowers is out of sync with the pounding of the drumbeat.
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.
Factual error: The 'rudder' oar is fitted on the Port (left) side of Ragnar's new boat. The starboard of all boats and all floating vessels is named as a result of the steering oar always being fitted on the right hand side of the boat and it is depicted on the Bayeux tapestry as reference. It is very natural also for right handed people and for anybody who ever used a Canadian canoe.
