“Film fans of a certain age, and some of them are certainly represented and name-checked in the film, will immediately recognize the true subject of the new documentary by Kent Jones, Hitchcock/Truffaut . It’s not a dual biography of the French director and the British director (ensconced in Hollywood by that time), but rather the biography of a book. Hitchcock/Truffaut (Simon & Shuster) was published in 1966, a transcription from a series of interviews Truffaut (then 30, and having finished his third film, Jules and Jim, held with Hitchcock (having finished his 40th film, The Birds) in 1962, with Helen Scott as translator, discussing his films title by title, from production histories to aesthetics. As a work of cinematic analysis, nothing like it had been done before. Film culture was still defined by Hollywood studios and fan magazines that ran puff pieces on the latest blockbusters. There hadn’t…