1. There is so much Hitchcock here. The voyeurism of the audience. The use of lenses to draw the audiences eye. The first Hitchcock blonde! And that wickedly dry sense of humor. It's all there. I'm looking forward to seeing the rest of the film to see what other clues there will be.
2. Absolutely. As others have noted, and are indicated in the answers to the first question, there are lots of elements that would be characterized as 'so Hitchcock' even before he was Hitchcock.
3. I don't think the lack of dialogue distracts at all. The images that Hitch puts together are more than sufficient to tell the story he's trying to get across.
I have to admit that I'm downright giddy about this class. I had the best time taking the Noir class and still have the certificate framed in my TV room. I have a great appreciation for Hitchcock's style and I'm excited to have the opportunity to see his early films and to explore his evolution in an academic setting. Because I'm a huge nerd.