The man standing with Bill on p. 209 of Bill's book who is identified as Truman Capote is definitely not Truman Capote (for one thing Capote stood 5' 2" tall, and this man stands at the same height as Bill. For another the Stones and Capote weren't too keen on each other after Capote's accompanying their 1972 tour. And, in general, by 1981 Capote was in rather a social oubliette).
Having said that, I'd once read Bill say he'd invited Peter O'Toole to a Stones L. A. concert in 1981 and that O'Toole (my favorite actor) told Bill afterwards that he was astounded by the energy rush of that stadium show. So I was very pleased to finally see Bill's photo—on p. 214—of O'Toole at that L. A. show.
Incidentally, on p. 144, the top photo said to be Keith doesn't look like Keith. It could be him at an odd angle, but I think perhaps Bill (improbably, yes) misidentified who was in fact Ian McGlagan (who is photographed at those same sessions two pages later). Would Keith have worn a Tom-Petty-and-the-Heartbreakers T-shirt in 1978?
Maybe I'm unfairly thinking of this shirt: