Thank you. I don't speak Japanese but I already knew one thing - "thank you" is "arigatou". But when thanking you (which happens a million times a day - everyone is so polite!) people actually seemed to be saying something else. It took me a while to figure out it was the more formal "arigatou gozaimasu" (pronounced "goes eye moss" with a silent "u").
You get hand towels at eating and drinking establishments. Sometimes it's a real towel (face washer sized) and it's hot. Sometimes it's a small wet napkin in a plastic bag (like you used to get on planes!) It's always nice.
You don't need to press the button at traffic lights (and often there is no button). Well, this was the case pretty much everywhere we went. Occasionally you need to press the button at night but generally the lights just cycle through, as there are always pedestrians everywhere.
People wait for the green light at traffic lights. Yep, no crossing on the red! Generally, anyway. Why rush?
Crows. Or maybe ravens? There were loud, squawking crows everywhere we went. Initially they freaked me out (is it an omen?!) Then I got used to them. Apparently they're very smart, remember faces and do swoop people, so don't be mean to them, as they'll remember you next time!
Footpath = road. It's not the case everywhere, but in lots of places we went to there's no footpath and you just walk on the side of the road. It's how it's always been so it's very safe, but it took me a little while to get my head around the idea.
So many pot plants. It's definitely not the case everywhere, but in the first area we stayed in Tokyo, there are pot plants all over the place. There often isn't room for everyone to have a garden but you can still have greenery this way. Excellent!