I have to also chime in on cultural drift, appropriation and mis-appropriation going both, or all, ways.

I love Anime. It's basically just TV in Japan and I can't really see anything wrong with trading each other's pop culture back and forth since it is a thing of the now. However some animes make my head hurt with the things that the Japanese writers did to western culture, either in Trinity Blood, Evangelion, or that one where the Norse Gods are all a bunch of teenagers in modern Tokyo. Specking of Norse deitys, what is it when someone with a clearly Nordic name is writing "Thor" comics without attention?