I think unfortunately she doesn't call Clint, though - I had been mulling over this since I saw the Vanity Fair article that said the same thing, because I hadn't heard it as clear when I watched it...though I had only seen it twice at that point and the first time was like an onslaught of feelings and the second time was wrapping my head around everything, so I definitely accounted for the fact that I might have missed it.

But last night I saw it again and I'm pretty sure she definitely says Klein (if you listen for it you can hear how it differs from "Clint") and spectralarchers confirmed with her post where she saw subtitles: http://spectralarchers.tumblr.com/post/173481099317

I think it totally still works to use the headcanon for fic and other things, though. I'm definitely still going to, at least! If we heard it wrong, chances are most people did too ;)