It reminds me, in reading it, of Robert Graysmith's Zodiac book which I know had some stories mixed in that may not have been true, but was still a cracking read. So let's just say so far I'm cautious but very fascinated with this book.
I also got a kick out of hearing people describing the repulsive (no pun intended) Polanski as the 'original five-foot Pole you wouldn't want to touch anyone with'. It sounds like people really didn't think much of him as a person back then (the people in his orbit, I mean).