I ran across this documentary at NetFlix, and I've seen it at least five times. Every time I watch it, I pick up something new.
One of the editors is particularly interesting (forget his name), because he stands up and physically gets into the flow, and I like the way he has all the clips laid out on some kind of illuminated display.
And I was fascinated to learn that editing started out as "women's work" like sewing and phone operator, and when sound came into the picture that's when men got into it.
Editing first started as a way to strictly conform a production to standards of the day, not so much for artistic enhancement.
Nowadays, the editor "makes" the movie and actually creates the "feel" and "tempo" etc. working one-on-one with the director in post.
A lot of great interviews too.