Not long ago, Daniel Radcliffe arrived at the offices of this magazine, wearing a maroon cap and a green jacket and clutching a latte. He had come to try his own hand at fact-checking, with the help of The New Yorker’s fact-checking department. Radcliffe had a few things to verify himself. Passing a wall displaying recent New Yorker covers, he said, “That makes me feel a lot better about our play. We’ve talked about whether an editor would have loads of covers in their office. I’m going to go back and say, ‘Yes.’ ”