Dunno if you like books, but there’s a great book about the American punk scene from ‘81 to 91’ that details Dü, along with a dozen or so other bands from their formation on through the years. Lots of great stuff in there.
If you haven't done so already, you should read the chapter on Dinosaur Jr in the book Our Band Could Be Your Life. The impression I got after reading that was that Barlow was more difficult to get along with than Mascis.
Actually got into them recently while reading Our Band Could Be Your Life. Double Nickels is awesome but it's kind of an imposing start. I dug in a little and picked up What Makes a Man Start Fires and the Buzz of Howl EP. Grittier but they complement each other really well.
Which brings us to Our Band Could Be Your Life
All those bands weren't "punk," but they really were.
Also an honorable mention to Love is a Mixtape and High Fidelity as well.
It's not a movie, but Our Band Could Be Your Life is a great read.