amelia from the videos

The Death Star trench run was originally scripted entirely different, with Luke having two runs at the exhaust port; Marcia had re-ordered the shots almost from the ground up, trying to build tension lacking in the original scripted sequence, which was why this one was the most complicated (Deleted Magic has a faithful reproduction of the original assembly, which is surprisingly unsatisfying). She warned George, "If the audience doesn't cheer when Han Solo comes in at the last second in the Millennium Falcon to help Luke when he's being chased by Darth Vader, the picture doesn't work." 

[Marcia Lucas] was a stunning editor...Maybe the best editor I've ever known, in many ways. She'd come in and look at the films we'd made--like The Wind and the Lion, for instance--and she'd say, 'Take this scene and move it over here,' and it worked. And it did what I wanted the film to do, and I would have never thought of it. And she did that to everybody's films: to George's, to Steven [Spielberg]'s, to mine, and Scorsese in particular.

I know for a fact that Marcia Lucas was responsible for convincing him to keep that little “kiss for luck” before Carrie [Fisher] and I swing across the chasm in the first film: “Oh, I don’t like it, people laugh in the previews,” and she said, “George, they’re laughing because it’s so sweet and unexpected”–and her influence was such that if she wanted to keep it, it was in. When the little mouse robot comes up when Harrison and I are delivering Chewbacca to the prison and he roars at it and it screams, sort of, and runs away, George wanted to cut that and Marcia insisted that he keep it. She was really the warmth and the heart of those films, a good person he could talk to, bounce ideas off of, who would tell him when he was wrong.