1) When Trencavel is parleying with Simon de Montfort he speak of inquisitors. The conversation takes place in 1209, but the inquisition was not created until March 1233 (by Pope Gregory IX). 2) Simon de Montfort was not officer in charge of the crusader army which took Carcassonne in 1209. He was just one of several knights in the army. The officer in charge when the crusaders took Carcassonne was Arnald-Amaury, abbot of Citeaux. Simon de Montfort accepted the viscounty of Carcassonne in a council held by the victors in the taken Carcassonne. 3) Various scenes where swords are seen to penetrate chain mail are bogus, swords of that era could not do that.
