 All four films were released by Hung's production companies, Bo Ho Films and D&B Films.In "Pom Pom" (1984), Hung, along with Charlie Chin and Stanley Fung cameoed as their characters from "My Lucky Stars", which was released the following year.Jackie Chan and Yuen Biao also made cameo appearances (as a motorcycle cop and truck driver respectively), and a number of their Hong Kong action film contemporaries also made appearances, including Deanie Yip, Lam Ching Ying, Philip Chan, Dick Wei and Wu Ma.