It was probably shot on film at 24fps, then a 3:2 frame sequence is applied to convert to 30fps, which is then slowed down to 29.97. This slowdown (known as a "

It was probably shot on film at 24fps, then a 3:2 frame sequence is applied to convert to 30fps, which is then slowed down to 29.97. This slowdown (known as a "pulldown" in the jargon) causes the drop in pitch of the audio. (Sometimes things are actually shot at 23.976, so that they can be sequenced straight into 29.97 without needing the pulldown, but I'm not sure how common this is). The other thing is that when converting to PAL, you have two choices - either apply a very complicated frame squence that I've long since forgotten all the details of, or just speed up the footage from 24fps (or 23.976) to 25fps, causing a raise in pitch. So it's quite possible that neither of the versions you watched were actually at true speed or pitch - the NTSC version could have been slow and the PAL version could have been fast.