A concern is the vast majority of the movie audience isn't as familiar with Japanese culture as most of us game/magna geeks are. Some very important, to a Japanese audience, points are totally missed or misinterpreted by Joe/Jane Average from the USA//Germany/Turkey/Wherever. Like it or not American culture is fairly universally understood (even if disliked) so a certain amount of "white washing" by any movie studio is going to happen if they don't want their movie to appeal to only a niche audience.
I get what you mean, but again it's not helping change things, it's not helping people understand more other cultures and points of view that we do this. And there may be other things that make it easier to understand for the general public than just that pervasiveness: we are after all talking more about a western audience, which includes the rest of the Americas and Europe, and so, a country made up mostly of a majority of descendants of European colonists is going to be easy to understand to this kind of public.
But nothing special made me understand GITS a bit better than other people: I don't know jack shit about Japan's language, history, geography... I don't take more interest in it than in any other culture... in fact I wasn't into anime until I got to GITS SAC. I just made the effort, which wasn't that much to do, to try and understand it. I made connections with things that are closer to what I know of my own or other countries, their history, politics, news, technology, trends...
Take for example the Laughing Man (which they say may be the plot they go for for this movie). I had read the Catcher in the rye, although I didn't really appreciate it. Until very advanced in the plot I didn't know there was a connection but there was an episode that started giving me vibes of the book's tone and, big reveal, there was a connection. Then the character and its memetic element has a lot to do with Anonymous:
there isn't one but many, as a group it's so disgruntled that each of them has their own incompatible agendas, they hide their identities behind a kind of mask whose origin is as detached from their hacker personas, their origin is hard to trace. In the end it's all a thing of memetics: who was the first Laughing man? Was it Aoi who did that kidnapping stunt in front of the cameras, the person who released the data that Aoi found and made him take on this crusade, the designer who created the logo?
Why did Anonymous take the persona of the Guy Hawkes mask? Did they take it from V for Vendetta by Alan Moore, about an anarchist terrorist in a dystopian London? From the movie adaptation? From the real Guy Hawkes who served the Spanish Crown and the Vatican, not to bring anarchy to England, but to bring it under the influence of the Catholic Church?
Being forced into security treaties or trade agreements is also something that I can understand without being Japanese, because other countries can also live things like that.
I think what really pisses me off is that producers look down on and talk down to their audience like they can't understand the world is bigger. We've come to a point where we ourselves end up justifying that the western editions of Pokemon have to shy away from teaching children what onigiri, a traditional Japanese snack that could just be simplified as "a rice cake", is, that there are other cultures, the culture that created the franchise... while we don't shy away from, well, teaching them the names of the Pokemon themselves, their techniques and which one beats which other one, which isn't even cultural knowledge.