Meh, if the audio pitch is preserved (relatively easy to do), who'd even notice? Now, NTSC motion jitter, on the other hand...
Mind you, that doesn't mean I think PAL is flawless. I applaud the advent of 1080p24. Both video formats have their drawbacks, but I honestly do think NTSC is the lesser one, and it's just as crap at preserving the presentation of the film; you still don't get the film at the correct speed.