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.
