I agree. That is probably the only thing that made this DVD worthwhile. Even though they don't show the song in it's entirety, it's interesting because they brought the Mothers of the Disapeared on the stage and Bono paid a moving tribute to them.
Basically, it tells the old story of how Eno nearly destroyed the demo for "Streets", and how "Running to stand still" was made up pretty much on the spot. They play back the tape of "Still haven't found" and they find all these sounds that they recorded for the song that never made the cut. It tells us that the guitar and bass for "Bullet" are not in the same key with each other, and how Edge liked the minimalistic approach to the ending of "With or without you". Nothing is mentioned about "Red Hill Mining Town", "Trip through your wires" and "One tree hill" at all. If you're into that type of thing, go for it. It's interesting, but one of those things that is only interesting the first time you watch it.