^I remember watching latest James Bond movie and thinking that it is fairly obvious that this isn't an American film. AFAIK American movie heroes tend to be a lot more casual than Bond is.
I find American heroes to be much more cowboy & action-oriented than non-American heroes. I almost wonder if they've amped up Bond from the books just to make it more appealing to Americans.
Also, I found that while I was in Greece, I had to clean up my English in order to be understood. Apparently I would mumble, slur my speech and draw things out (I guess a feature of some parts of Missouri), so I started trying to clean my speech up, and actually had two Greeks tell me they didn't think I was American because I was so easily understandable and didn't have a strong accent.
I also met a Greek-American girl who lives in Greece now who runs a salon, I was sent there for a haircut. It was funny how both of us started out with cleaner speech, and then fell back into our natural accents, me into my Western Missouri accent, her to her New York/New Jersey accent.