The film is unusual in that although featuring Sammo Hung and Lam Ching-ying, two actors famed for their kung fu abilities, neither actually perform any martial arts. Golden Harvest had wanted Hung to perform fight scenes in the film, but he refused, rationalising "My character was mentally retarded, mentally disabled, so how can you ask me to fall down and suddenly become well again? And fight? They knew my fighting skills and wanted me to be part of the action but I thought that would have completely destroyed the tone of the film, the principles behind the film."[1] The action is left to Chan and his fellow CID officers, Mang Hoi, Yuen Wah, Chan Lung and Corey Yuen. Despite the relative lack of action scenes, the film was nominated for the Best Action Choreography award at the Hong Kong Film Awards in 1986. It was beaten by Chan's Police Story. The bad guys are led by James Tien and include Dick Wei, Chung Fat, Phillip Ko and Kao Sau-leung. The film also features a small role for Wu Ma as a restaurant owner, and like My Lucky Stars, Sammo Hung's real life brother makes a cameo appearance as a Policeman (who walks into Inspector Wong's office without knocking).
