Character mistake: When Brenda first witnesses Connor and the Kurgan fight, Kurgan says "I am the only one." Afterwards, Brenda asks "What does he mean by there can be only one?" She somehow misheard Kurgan and thought he said the movie's iconic catch phrase.
Suggested correction: This is incorrect. He does say "There can be only one." He's saying it while beating Conner, so the first part is a little muddled and he emphasizes "one", but he does say the line.
Character mistake: 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.