Since the opening sequences take place in Hong Kong, the characters speak in Cantonese dialect. However, since Jet Li is mainly a Mandarin speaker, his Cantonese voice is dubbed by another voice actor, while he only recorded his voice in English.
In the chapter that takes place at the Metreon, a movie poster sporting the title "RABM" can be seen. RABM is an acronym for "Ridge Avenue Bogey Man", an urban legend of the New Jersey area, where producer Jim Wallace grew up.