[Paul11]

Not too much eye contact when speaking with people. Proxemics and nonverbal communication are very different. But they are powerfull controlling forces on our way of communicating. Typical western way of holding eye contact during a conversation will make people uncomfortable. You might also find it difficult not to do so.

Also, if your in someone's home and use the bathroom, don't forget to take off the "bathroom slippers" in the bathroom and walk around the house in them.

In a restaurant, if you wait for service you probably won't get it. If you need something call out, "sumimassen." the wait staff will respond. If you did that in the states, they would probably spit in your food. It may feel like you're being rude, but it is the way.

Just a few off the top of my head.