I think my favorite thing about the movie is the exchanges between Jack and Meg (or lack thereof). They are the definition of 'polar opposite'. Jack is outgoing, charismatic and just plain loud. Meg is shy, reserved and just plain quiet. Its easy to see how one of the rumors is that they are brother and sister because that's exactly how they act.
The live performances should be (and are) reason enough for you to watch this movie. I would argue that they are some of the best versions of the songs. I've said it before and I'll say it again. The White Stripes are better live. I'm not saying their albums aren't good but, compared to their live performances, their albums aren't good. :)
Basically, what I'm getting at here is this: if you're a White Stripes fan you need to see this movie. If you aren't a White Stripes fan you need to see this movie. If you're breathing right now you need to see this movie.
"...but when it comes to the music, thats not pre-meditated at all. The music is really completely in charge of us."