Wang Han Chen plays the role of a policeman/officer.
Yeung Sai Gwan plays two small bitparts, so I would say he's an extra.
Wong Ching Ho plays the role of the father of Biao's (Yuen Wah) fiancee.
Yiu Ping
plays the role of the drunken beggar Yao Xiao Tian.
I believe there are some names of actors on the credits, which are not listed (but, with all those aliases, I can be wrong about that).
