The recent limited series “The Offer” reminded viewers that before Albert S. Ruddy was taken seriously as the producer of “The Godfather,” he was often dismissed as the guy who created “Hogan’s Heroes.” Similarly, another key architect of the New Hollywood of the 1970s — director and producer Bob Rafelson — would find himself earning greater respect as the man behind such iconic, essential American films as “Five Easy Pieces,” “The Last Picture Show” and “Easy Rider” than as one of the creators of “The Monkees.”The difference, of course, is that “Hogan’s Heroes” is the kind of old sitcom contemporary audiences would call “problematic,” while “The Monkees” has endured both as a screwball piece of television and as the launching pad for a band that’s beloved to this day.