One of the historical inaccuracies this show tells is in the Norse conjuring of Mercia. This show tells of one of the Norse leaders to be Ubba the son of Ragnar Lodbruk. In actuality it was one of Ragnar other sons Ivar the Boneless that led the raid on Mercia.
Eoferwic, where the Saxons are planning to meet for battle early in the episode is the modern city of York.