Award Snub: One of the most famous. He never won a competitive Academy Award (he did win an honorary award late in his career). Inexplicably, one of his films (Rebecca) won best picture without him winning anything for it.
Alas, he might have won something if he put his name beside David Selznick, as a producer.
Fridge Brilliance: In a way this applies to Hitchcock's entire career. For a long time he was not given appropriate credit for his genius; then in the late 1950s French New Wave critics started to look at his films not just as lurid thrillers but as artistic works with extraordinary psychological depth.