Read this last night - it's brilliant. Highly recommended to spend some time reading that.
One of may favourite podcasts did an episode on it too.
Remarkable it ended up getting finished.
Most reports suggest Spielberg wasn't liked at all by the crew (and the conditions they had to work in) and the exact moment the last shot was filmed, Spielberg did a runner as some of the crew were going to throw him into the sea.
What I love about Spielberg movies is the realism of the acting and scenes. It's obvious in ET with the family scenes with the dialogue that feels so realistic and life like (rather than clearly scripted/acted).
He did this by having the cast just run through stuff, playing around, talking to each other until that natural, human flow came through (and that's when he turned the cameras on).
You can see it in Jaws too.
Podcast link here:
https://www.earwolf.com/episode/jaws-2/