Hiding the page title, widget sidebar and comments on pages

Hi, I'm not sure it these things are showing themselves because I'm the admin, or if they're visible to everyone, but is there anyway to not have the page title, widget sidebar and comment box to show up on pages? It's making the pages look like posts, which is not something I want, and I especially I don't want people to be able to comment on pages like my "restricted access" page.