I n the end, I always thought about his Birkenstocks. I’d often glance over at them during our interview , both of our pairs positioned next to each other on the studio floor, below the couch where we sat. Those are Bob Weir ’s Birkenstocks! I thought. But he didn’t pay attention to the sandals, which had become his signature look in his later years. He was busy playing ball with my questions the best he could, stroking his beard and sipping on a glass of Coke. He gently opened up to me, the