This is the first Zatoichi film to use the blood spray practical effect. Coincidentally, the first Japanese film to ever make use of this effect was Akira Kurosawa's 'Sanjuro' (1962), which also featured actor Takashi Shimura.
This is the first Zatoichi film to feature Takashi Shimura (he portrays Dr Junan).
This is the third Zatoichi film to make use of a vocal song which is non-diegetic to the the soundtrack.
Zatoichi's katana is a shikomizue. This is a sword which is concealed within a wooden cane, thus the cane itself is both handle and scabbard.
This is the eighteenth of 26 films to star Shintaro Katsu as Zatoichi.