Factual error: There is a scene with several flags hanging on the wall of the castle. These are supposed to be flags in the Middle Ages. However, one of them is the present day banner of the Hungarian Republic (where part of the movie was shot).
Factual error: Towards the end, when the medics are reviving Martin Lawrence, they are using a defibrillator. You can hear the sounds of the defibrillator charging and then discharging. They then show Martin Lawrence wake up, but he is fully dressed. In order for a defibrillator to work, it must come in contact with the skin. I doubt they had enough time to redress him after using it on him. (01:22:40)
Factual error: When Jamal is to be executed, the executioner chokes on the melon. However, he is coughing. It is impossible to cough while choking due to the blockage of the windpipe. (00:51:30)
Factual error: In the 14th century, Normandy was an enemy of Britain's. There is no way a Duke from Normandy would marry an English princess.