This list is from the book, 'Conversations with Wilder' by Cameron Crowe, an interview book with writer/director Billy Wilder. I think it’s great and I believe than it can be applied when writing for film or TV, or a novel, or even comics. I'll just post it here as a reminder:
1. The audience is fickle.
2. Grab ‘em by the throat and never let ‘em go.
3. Develop a clean line of action for your leading character.
4. Know where you’re going.
5. The more subtle and elegant you are in hiding your plot points, the better you are as a writer.
6. If you have a problem with the third act, the real problem is in the first act.
7. Let the audience add up two plus two. If you do, they’ll love you forever.
8. In doing voice-overs, be careful not to describe what the audience already sees. Add to what they’re seeing.
9. The event that occurs at the second act curtain triggers the end of the story.
10. The third act must build, build, build in tempo and action until the last event, and then—that’s it. Don’t hang around.