Deliberate mistake: Although the first account of what happened in Zhao isn't completely true, the arrows penetrating the calligraphy school are sometimes flying at angles that make their trajectory impossible, such as arrows flying perpendicular to the ground or even flying upward.
Hero (2002)
1 deliberate mistake - chronological order
Directed by: Yimou Zhang
Starring: Jet Li, Donnie Yen, Tony Chiu-Wai Leung, Tony Leung Chiu Wai, Ziyi Zhang, Maggie Cheung, Zhang Ziyi
Continuity mistake: In the third rendition of the story of what happened at Zhao, Nameless shows that his attack could have immense precision by throwing all the additional sticks in the air along with the white one. Not only does the white stick change trajectory during the scene changes, but at the end the additional sticks all seem to fly in from a barrel just out of sight instead of falling all around Nameless' sword.
Flying Snow: Since you wish to die, I will assist you.
Question: Was this film based on an true story, or was it fiction based on the true warring states as the backdrop?
Answer: It was a fiction based on the true historical period as backdrop, althought it sorted of resembled a true event that the deserter general of Qin gave his head to an assassin as a pass to get close to the Emperor, who was then still a king of a state among the warring states.