San Wan (played by Jimmy Nah) is referenced in the opening theme song, though it is also a play on what he does as well, in terms of handing out fines (or summons) to errant drivers who illegally park their vehicles.
Apart from Sanwan (played by Jimmy Nah), Lin Bang (played by Haung Wenyong) and Auntie Automatic (played by Li Yinzhu) are also referenced in the opening theme song.
The karang guni mentioned in the opening theme song is the modern version of the rag and bone man.