Factual error: Somewhere in season one Mary refers to Germany. But since this was set in the 16th century it would've been Prussia.
Other mistake: When Greer and Castleroy are having dinner together he asks Leith to pour wine for them, but what comes from the jar is water. (00:15:45)
Continuity mistake: When Francis falls into the frozen lake he is wearing gloves, but when he is shown under the ice he doesn't have them any more. When Bash pulls him out he is once again wearing gloves.
The Lamb and the Slaughter - S2-E4
Continuity mistake: When Greer and Lola are talking outside by the pond the first shot they are facing each other. The next shot from behind shows them both looking out to the pond. The following shot they are facing each other again.
Continuity mistake: Bash takes his shirt off revealing the wound on his right arm. He starts wrapping it again with cloth and the scene cuts to Kenna. It cuts back quickly to Bash and his bandage is fully tied. There is no way he could accomplish this one handed.