SHAFTR - perhaps the prologue is used to introduce the audience to a different type of sound mix, where you don't have to hear what the people you see are saying, only what is important and necessary (i.e. Ricky Jay's narration or the lyrics to "One").
I remember while writing this, I wish I had the sound people in front of me to ask why and how in the fuck they were able to mish-mash such seemingly incoherent noises together, and still evoke emotional responses. How did they know it would work? It's incredibly ballsy.