List off all the Hitchcock references you can find

I love this video I found on YouTube:
www.listal.com/video/3564223

Basically, its a homage to Hitchcock, but set in the Half-Life 2 universe. It's amazing video, everyone should see it. See how many bits of homage to various you could find.

Upon first viewing, I've noticed the following:

- Vertigo (when the guy falls off the roof)
- Rear Window (blonde 'Alyx' spying on you?)
- North by Northwest (travelling around on map?)
- Psycho (bathroom scene at abandoned house)
- and of course, Birds :)

There's got to be more, but I'm stumped.