Answer:
- Despite the movie being set in Japan during the 1870s, the flag of the United States is shown to have 43 stars, which wouldn´t happen be possible before 1891.
- The Meiji Emperor should have been called Emperor Mutsuhito while still alive, while his reign name could only be used after his death.
- According to Japanese tradition, weapons should have been prohibited in the Emperor's presence.
- According to Japanese tradition, Japan is believed to have been formed when a jeweled spear was dipped into the sea, not a sword, as it´s stated at the start of the movie.
Explanation:
There are several historical inaccuracies, which reveal a deficient understanding of the Japanese culture and the samurai tradition.