Even before getting to all the great questions you posed here, I think there's one other thing that this script shows repeatedly: If you're the writer/director, you can write quite differently than other screenwriters. Take this little piece of description: "Chris watches, horrified. Never in his life has he seen something so horrifying as this. And yet he does nothing. He is part of it." Fully half of it is what we'd call "unfilmable." Those of us who aren't Oliver Stone would write: "Chris watches, horrified. And yet he does nothing." And then we'd worry we were too wordy, or telling the actors what to do. Watching films, reading the scripts, doing both together? All great ways to learn the art and the craft of making a film and writing a script. BUT, the majority of us aren't Stone, or Tarantino, or Cameron... We can write novels like this, but not scripts. We might be able to sneak in some little snippet of "atmosphere" here and there, but, it would have to be with an incredibly deft touch.

Right there with ya!