I love this part:
KURTZ: .....I just don't like changing whatever a film is like when it's finished – good, bad, or indifferent, that's the way it was it released and the way the audience perceives it. To keep fiddling with it, long after the fact... Jean Renoir said in a documentary interview that we did with him when we were all film students, that something that he learned from his father was that, for an artist, the most important thing is to know when you're done, and leave it. Of course for a painter, it's absolutely crucial, because you put too much extra paint on and you've ruined the painting. With a filmmaker, you have a certain amount of recourse and you can change it again, but the principle is still the same – to know when you're done, and when it's over, and when it's finished – and you walk away. It's critical, because you can be like Kubrick, and you can work on it forever, and it's still not going to get any better.
IGNFF: At least one can say Kubrick didn't go back 25 years later and add a scene to Dr. Strangelove.
KURTZ: No, he didn't; or 2001, or any of those early films. He at least accepted that they were finished, and that was it.
IGNFF: And wouldn't allow others to tinker with them, either.
KURTZ: No.