For example, dishes may be served in a sequence different from what we are used to. If you're polite, perhaps the server will point out the things on your plate not intended for consumption, such as garnishes. Otherwise, she'll just watch as you gulp them down with a grimace. Business and personal cards are offered at even a casual meeting. Gain status by bringing some along.
Cards also help avoid errors in pronunciation and help new friends keep in touch.
I'm thinking of habits including chewing gum in public, interrupting when another is speaking, and slapping someone on the back. Although shaking hands on meeting is a widespread practice, watch to see what local custom is. Head In Thailand, among other places, the head is considered the abode of God in a person. Therefore, avoid touching anyone's head. If you do so accidentally, apologize.