The thing I was up against in documentary films - was trying to get non-actors to convincingly play themselves in a way I'd come to know before the camera started rolling. And many non-actors can't do that convincingly, even if they just have to play themselves - they can't be naturalistic. And I would always want to recreate something I'd witnessed them do or say, and it just would be incredibly difficult because of the fact they weren't actors.
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