More Oscar stuff. Just to show you how rare it was for director/picture not to match, I'll give you a little history lesson. Starting with the 60's, there was only one non-match, in 1967, when In the Heat of the Night won and Mike Nichols won for The Graduate. Forward to 1972 where, amazingly, Francis Ford Coppola did not win for The Godfather. Bob Fosse won for Cabaret. You then have to go all the way to 1981 to find the next one, where Chariots of Fire took Best Picture but Warren Beatty won for Reds. Then another long period of time until 1989 when Driving Miss Daisy won Best Picture but Oliver Stone took best director for Born on the Fourth of July. All best pictures/directors matched until 1998.

The 40's and 50's had three apiece that did not match, and before then it was actually common. What's interesting is that you'll find a lot of times John Ford would be best director, and his picture would not win (although he has a couple that match as well)