Spirit of the Story - Screenwriting

Make sure that whatever inspired you to write the story, whatever excited you, remains in the story, and throughout the story.  Don't let yourself edit it out as you write and revise.  Don't let your worries edit out the reason you started writing the story in the first place.  If you feel like you've lost that initial spirit.  Let the story sit for a little.  Don't rush and add scenes just to get done.  Don't add scenes because you think they'll fit a structural model or theme idea.  The spirit is key.