Heh, since when does anyone in a movie know how to RNC? They usually do the goofy Hollywood choke, where you extend your arms out like Frankenstein and try to choke them with your fingers. And the alleged hardened, trained warriors in these movies are somehow unable to break the choke.
I see RNC a lot in films actually, especially more recent films. It's never done right though, but occasionally you'll see something like an armwrap choke from guard (Inception) and shed tears at the awesome.