One of my favorite screenwriters to follow is Ken Levine. He has had an amazing career in television and features writing for MASH and Cheers among many others, as well as directing.
He has great comedy chops and I always learn something from his posts. (He is also a professional sports announcer, so his talent apparently know no bounds. Sickening.)
He came across a fascinating 18 minute YouTube video on how poor the pacing and story telling were in the original rough cut of Star Wars and how much impact Lucas’ editors had in getting us to the final cut we know and love. (At least the final original theatrical cut. Lucas likes to tinker.)
If you are interested in story-telling and getting a better appreciation for the importance of editing, it’s well worth the time.