 Though Yuen Woo-ping was credited for the martial arts choreography on "Kung Fu Hustle", Hung actually did the preliminary work but left the film midway through, and Yuen filled in to complete it.Because of his departure from the film, there was tabloid speculation that he and Chow had strong differences over the film, resulting in their separation.Chow has since responded that Hung left for personal reasons and not because of speculated tensions.