Corrected entry: When the knights leave on their quest to save the Roman family, they leave alone; then, at the estate, the Bishop's assistant suddenly appears, with no explanation as to how he got there.
Corrected entry: When Merlin's warriors trapped Arthur and his men in the forest, they used barbed wire. Barbed wire was invented in the United States in the mid 19th century.
Correction: They used barbs from trees and wrapped them together to look like barbed wire.
Corrected entry: If even hardened troops were afraid to go north of Hadrian's Wall, it is highly unlikely a noble Roman family would be up there - outside the protection of the Empire - living in an unfortified villa with just a handful of guards.
Correction: It wasn't just a "noble family" living up there. They were missionaries, who have always lived in dangerous areas since the beginning of Christianity.
Corrected entry: In the scene where Arthur and the Bishop are sitting at the round table before the Bishop tells him about the new mission, he opens up the box with the release papers. There are only 6 rolls of paper and there are seven knights.
Correction: The release papers are for the Sarmatian knights only, not including Arthur. There are only six of the Sarmatian knights.
Corrected entry: They did not have contacts back in that period, but you can see that Keira Knightley is wearing hers in the scene where Arthur sets her broken fingers.
Correction: I could not see it going frame by frame on my 32" TV.
Correction: I thought the same thing. While it looks this way, the Bishop's assistant did ride to the estate with the knights. His horse is seen briefly in the back of the line as the knights are riding cross-country. You really have to be watching for him in order to see him.