If you're interested in this matter of O.J. Simpson's "confession" in his ghostwritten book, you'll want to read this piece by Timothy Noah. He says, and I suspect he's right and I was wrong, that the ghostwriter, Pablo Fenjves, extensively interviewed Simpson. Noah also suggests that the construction of the "confession" sounds like something a guilty Simpson would dictate, filling in some details and punting on others. Makes sense to me.