1. Should be Mr Chu = Lee King Chue? But doesn't look like him?
2. Thought it was Bruce Leung Siu Leung, but must be Yeung Sai Gwan? + ? + ?
3. Lin Ke Ming?
4. Casino worker
5.
6. Gordon and San Sin?
7. Wilson Tong & ? & ? & ? & ?
8. Students
9. The librarian is Lam Wai (1)? Wouldn't have recognised him as the sworsdman in A Chinese Ghost Story :p
10. Some chiefs (chieves?)
11.
12.
13. Big dude... Yeung Hung (1)?
14. Gordon & Cheung Chin Pang in the background, but who are the monks in formation?
15. Cops
16. More cops
There's a few more background extras at the images page...
http://hkmdb.com/db/movies/images.mhtml?id=8977&display_set=eng
