Different Version or deleted scenes????????

I've seen this movie many times. But as a kid there were different scenes that are missing. Does anyone know what I'm talking about. I saw a post where someone typed, the razor blade scene. Well when this came out there was a really graphic scene involving the razor blade where keaton was in the dark and he splits the roach in half with the blade. But this scene is not in the movie anymore. And why was beverly D angelo not in the credits. And last, the scene where melanie is leaving the hotel and the phone starts ringing, in the original film it was KEATON/CARTER calling in a phone booth in the lobby. And that scene is gone too. What happened to these scenes?