1
I think that baseball is the most popular sports in Japan. And, most popular team is "Fukuoka Softbank Hawks".
4
It is famous Japanese custom to distinguish between the outside and inside of a house. For example, get off shoes in the house in traditional Japan. Now in Japan, there are twe tipe buildings that we should take off shoes and we shouldn't. That different point is step. Usually, we should take off shoes if building entrance has step.