It takes Peter Bogdanovich precisely six words before he drops Orson Welles' name in his new tome, Who the Hell's in It, a doorstop-size collection of essays on old film stars like Cary Grant, Jack Lemmon, and Dean Martin. But name-dropping is the book's conceit. Almost every one of these profiles more like remembrances, really is inspired by the veteran filmmaker's own encounters with the star in question. Whether the encounters are blinkingly brief (glimpsing Lillian Gish at a 1958 screening) or much more involved (a long Q&A with Jerry Lewis, circa 2000), they usually give Bogdanovich just enough material to make this volume worth a skim. Especially for the four people left on the planet who remember who Lillian Gish was.