When the Saxon throws his hand axe at the priest, it never flips as a hand Axe would do if thrown.
Ambrosia refers to Frick as a blatherskite. This word didn't come into usage until the 17th century.
The stones that the Sooth Sayer casts out has Nordic rune writings on them, when they should be Celtic.
The term "architect" dates back only to roughly 1500. The proper term would have been Master Builder.