I don't know, if you look at the movie and see how all those songs fit into the overall vision of the story, none of the songs seem that superfluous to me. I remember when the movie was released and I saw it for the first time, I thought it was amazing how some of the background noises/dialogue that were on the album showed up in the movie. Now granted, they could mold the movie to make it fit to some degree, but still, the overall concept was pretty flushed out when the album was released. Originally, we just thought all the background noises and dialogue were there to make it more trippy (and I can vouch, that it worked).