Has to be one of the best exchanges I've heard.
Woman: That's not my son.
Man: Well...I'm sure you're mistaken.
Gotta love that. The clip has a verite style, a looseness in framing and lack of precision in subject placement. For this scene at least, the viewer is a harried bystander trying to take in events, eyes darting, being jostled by the crowd, off balance. It's a good visual choice for the material, and the dialogue matches the camera technique in its bluntness.
I don't think the rest of Clint Eastwood's 'The Changeling' has such a direct style. This still, and the other bits I've seen, seem more structured.