ERIC TSANG - CHAN HEUNG NAM (DIRECTOR)
FRANCIS NG - KENNY (SINGER)
MAGGIE SHAW - CHEUNG MEI YIU (PRODUCER)
RUBY WONG - HIDY (YIU'S SECRETARY)
MICHAEL TSE - CHIU (DIRECTOR)
CHUN WONG - KK (YIU'S BOSS)
OSCAR LAM WAI KIN - TV MC
TONG HOI LUN - SAM (NAM'S ASSISTANT)
CHAN HO MING - CHIU'S P.A.
LO HOI PANG - FAT DAD (TV HOST)

CHRISTIAN NAME:
TONG HOI LUN - HELEN (AS PER CREDIT)

Done. Also, I propose that Lo Hoi-Pang and Leo Lo Hoi-Pang are the same person:

http://www.hkmdb.com/db/people/view.mht ... ay_set=eng
http://www.hkmdb.com/db/people/view.mht ... ay_set=eng

Because... it just seems unlikely that they're not