Closed Circuit is rated R primarily because it uses a spattering of vulgar language, including the magic "F" word more than once. (I counted two instances, but I could have missed one.) There is one big explosion and at least two instances of a woman being physically assaulted by a man. In terms of degree of explicitness, what we actually see is less graphic than an average episode of Criminal Minds or Bones. Some of the characters drink alcohol at a dinner party. Younger viewers may be bored—it's a very talky film—but if the viewer's primary concern is explicit content, this film is relatively tame by contemporary standards. It is stated that two of the characters have had an extramarital affair, but there is no on-screen sex or nudity. (Hall's character is shown in a slip and skirt while changing for a court appearance.)
Kenneth R. Morefield, is an Associate Professor of English at Campbell University. He is the editor of Faith and Spirituality in Masters of World Cinema, Volumes I & II, and the founder of 1More Film Blog.