Hitchcock likes to use a lot of tight reaction shots on the actor's faces which i think helps to draw us into their emotions, thoughts, & motivations. Spielberg does the same thing, but Spielberg goes a little overboard with it imo, while Hitch seems to know how to temper it sparingly with the action of the film.
I saw those reaction shots of the actors in both of these films we watched. Hitch also uses a lot of humor to break up the tension, a technique we see in a lot of films & TV shows nowadays. I think this is a very effective tool in storytelling.
The opening shot of a woman screaming does not require sound, because her expressions & actions carry the story along perfectly.
