Chinese pax, no pointing at people as it's rude (use your whole hand rather than a finger), also address the oldest person first (if travelling as part of a group).
Silence is golden with the Japanese and as a lot of western people are, being all touchy as you talk to people isn't really the thing to do either. Hand men their tray first with both hands and then they decide as to if they'll have it or pass it to their wife.
Also making sure the toilets are well stocked and clean as the Japanese find it very embarrassing to have to ask for more toilet paper etc. Also you can never say sorry enough, even if it doesn't really deserve it. They hate being singled out aswell infront of everyone.
Oz