This would apply very much to anyone who wants to live in or do business in Japan.
One of the stranger things about Japan I know of off my head is this strange event that happens after work, is very much similar to clubbing except for the fact it's office workers and the places they visit. Can't remember the term off my head, but it's pretty much the only time they allow themselves to relax and have fun. And to truly let out how they really feel about everything.
Well, that, and it's either the fact that a poisonous fish is a popular dish in Japan, the fact that Japanese life in the cities feels so regimented that it sometimes feels like you're in the army, or the fact that you have to remember to bow very, very low.
There's also the casual racism that seems to be the norm, revisionist history, pornography becoming art (though you must admit, Japan's probably the only country I know of that has actual pornography becoming an artpiece. I mean, The Fisherman's Wife seems to be flat-out porn, but it's considered art in some circles. Naked people were the norm in most Renaissance and other period artworks, but never in erotic positions for the most part...)