Speaking for GP: The problem with the word 'culture' is that it has an evaluating component (more culture = good), which I don't think is what GP meant. Maybe a better term would be "amount of hard rules in society", i.e. how many rules do you have to follow as a member to be accepted. In those terms, from personal experience, I'm pretty sure that Japan >> Western Europe > USA - correct me if you think otherwise.
Edit: I recommend watching the making of "Aliens" [1]. Young American (J. Cameron) goes to England to direct a British film crew, experiences surprisingly big cultural clash and the whole project almost ends in chaos, even though everyone was working at a very high quality level.
Edit2: Just to preempt here, yes I know Cameron is Canadian, but he clearly comes out of American movie making culture, so I took a shortcut there.
