Lots to ID here:
http://www.hkmdb.com/db/movies/images.mhtml?id=7944&display_set=eng
Here's some of the major ones:
1. The Chef - Wong San (2)
2. Works at Jing Wu Mun - Tam Suk Mooi?
3. Japanese ambasador... several sites say Toshimichi Takahashi, but they are probably all just getting that from IMDB... seems like a reasonable assumption it is him, but can't find any other pics of him to confirm.
4. Rickshaw Driver
5. Jing Wu Mun students
6. Japanese students