Yes, I did notice that! I was going to mention that in my post - about the 'younger ones' in the film having the most attitude. The more 'experienced' people in the film seemed to have a deep respect for what the river was and what it is now.I agree, the restarting each time an ad ran was annoying.
I did not think the film was incredibly negative, but the FB forum where I saw it was full of ‘drain it’ comments as of that was the only message.
Did you notice every person who was snarky about the dam and the change in the river was not alive to see the river in 1963 so their outrage is based on history info not personal knowledge