Factual error: In the scene where Mei is bathing in that small pool, you can see on her arm a the scar from her vaccination. As you might expect, they didn't have these vaccinations in the 1800s.
House of Flying Daggers (2004)
1 factual error
Directed by: Yimou Zhang
Starring: Ziyi Zhang, Andy Lau, Takeshi Kaneshiro, Dandan Song
Continuity mistake: Right before the final battle, Leo hits Mei with a dagger to the chest. During the ensuing conversation she frequently goes from having a bloody mouth with red teeth, to having a clean mouth with no signs of blood on her teeth.
Mei: To be free like the wind.
Trivia: The mysterious new leader of the flying daggers never actually appears because that role was intended for actress/ singer Anita Mui, who resigned the (impending) filming due to ill health two weeks before dying of cancer. Out of respect Zhang Yimou didn't replace her with another actress and the film is dedicated to her memory.