The film was promoted as being director Takashi Miike's 100th film, but it isn't. Although it was at one time his 100th directing credit on IMDb, that list also includes several TV series, TV episodes, and segments of other films. According to some calculations, Miike has directed over 100 works, including music videos and short films, but (at the time of Blade of the Immortal's release) fewer than 90 were feature films.
Manji is named after the symbol on his kimono in the original manga: the manji symbol being the Japanese Swazstika symbolising the cycle of life before it was bastardised by the Nazi regime. In the film the symbol is changed so as not to offend. In the original manga, manji has the symbol emblazoned on the earth of his kimono.
This movie is a British-Japanese-South Korean co-production.
Based on the manga of the same title.
Koji Yakusho has an uncredited role towards the end of the film as a Samurai.