I haven't seen the film yet but...
I have heard that the sound design is purposely distorted/mangled at the beginning and as the film progresses, the sound blooms slowly into high fidelity. Could this be the "distortion" that you are hearing?
Like in Grindhouse, when the audio would garble (wow and flutter!) as well as the film glitches that were intentional, to convey a sense of old 70's film vibe.
I watch a LOT of 60's/70's era film and messed up audio is typical of that trashy/exploitation groove-a-delic aesthetic.
Can't wait to see Inglorious Bastards. Supposedly, it is Tarantino's 'spaghetti western' and homage to tough ass 60''s/70's war films as well as perhaps being a remake (?) of the original 'Inglorious Bastards'.
