During the night market scene, Exhaust Pipe is heard singing an old, classic Chinese opera song that was typically sung by blind street musicians. However, when the blind musicians do show up, instead of singing a similar song, they sing their version of Rod Stewart's "Young Turks". The comedic aspect here is that locals would not expect the blind musicians to sing something so modern (at the time).
Jackie Chan's hair changes between scenes and this was due to his commitments to another film: Project A (1983).
The film's Chinese title, "Five Lucky Stars", was chosen as it was evocative of the Seven Little Fortunes (The Lucky Seven). The Seven Little Fortunes was the name of the performance troupe that included Hung, Chan, and Yuen, while they attended the Peking Opera School, The China Drama Academy, as children.
Charlie Chin was often cast as the romantic lead due to his previous roles in romantic melodramas. In this film, that image is reversed where he tries to flirt with women albeit unsuccessfully.
When Jackie Chan's character is first introduced, and subsequently reprimanded and demoted, he is assigned the role of arresting "laap sap joong". This was a character (a littering dragon) used to teach children to not litter, meaning Jackie Chan's character would be given minor duties to perform.