Fumio Demura, who choreographed the fighting for the Karate Kid series as well as doubled Pat Morita, makes a brief appearance in the film.
Scott Adkins, Valentin Ganev, and Velizar Binev all appeared together in Undisputed 2: Last Man Standing (2006) another Nu Image Film directed by Isaac Florentine. Adkins and Ganev would later appear in Undisputed 3: Redemption (2010) and Undisputed 4: Boyka (2016) together.
'Yoroi Bitsu' is Japanese for 'armor.' Thus, when the characters speak of the Yoroi Bitsu, they're not referring to the box itself, but what it contains.
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