Nope, a bit too early, but you're warm in one way: Seven Days in May and the movie in question both feature three of the same actors. One actor previously worked for Alfred Hitchcock, one previously worked for Blake Edwards, and the other previously worked for Stanley Kubrick.
(This is fun, but it's gonna take a whole page to write out the answers to the clues!)
(Oh, it's not The Longest Day, either.)