How they know you’re an American
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Interesting points.
If you recall, in "The Usual Suspects" there's a scene where Verbal Kint is standing outside a subway entrance, smoking a cigarette. He's holding it in a distinctly European way.
https://tvtropes.org/pmwiki/pmwiki.php/Fridge/TheUsualSuspects
When they are released from the lineup and go out on the street, while Keaton is talking to Edie Finneran, the camera cuts to each of the others. In one shot Verbal is holding/smoking his cigarette between thumb and forefinger and palm facing up. This is an Eastern European trait commonly picked up by others in the region like, say, Turkey.