As an interview subject, Christopher Nolan is an expert diplomat: He’s great at sounding forthright while not saying anything particularly revealing. But, holding forth on his career in an hour-long conversation with Foxcatcher director Bennett Miller at the Tribeca Film Festival last night, the Dark Knight and Inception director did open up at a couple of points. Maybe it was the fact that he was talking shop with a fellow filmmaker, but Nolan seemed refreshingly reflective, particularly as he discussed some of the opportunities he’d been given in his career.