La Jetee + telenovela.
Don't have much to add to what I wrote for Slant in 2011, except that Scottie manages to seal his doom by being a staunch empiricist in the first half ("There's an answer for everything!") and a deranged romantic in the second. Balance is important, one step at a time.
Also Konstantin Shayne really delivers in his Pop Leibel monologue in the bookstore, considering his is a Mr Exposition role. People who believe Hitchcock was "indifferent to acting" might want to think again.