Factual error: In almost all the swordplay, most of the parries are shown as edge-on-edge. This simply was not the norm. Edge-on-edge destroys swords. It ruins the edge and will cause them to break. Parries were done with the flats and deflection.
Factual error: When we first see Kurgan in modern day New York, he begins to assemble his sword in a motel room. The very fact that he is assembling his sword the way he is, snapping segments together, especially the blade itself, which is segmented in the middle, would make that quite possibly one of the weakest and most inefficient weapons a person could ever wield. Being that it is segmented the way it is, it is structurally weak, and a clash against another sword, or any hard surface for that matter, would break the segments apart easily.