John Fitgerald Kennedy was a Staunch Catholic and the open Casket was for his family and very closest friends. And I believe he was encased in glass? The face was not disturbed by the bullet but the cranial cavity was it was the back of his head and the side. The trauma would have disfigured the look and the structure of the face because to the skull damage so yes they did a lot of cosmetics including replacing the skull and hair. Oh the casket was closed to the public but not the immediate family and friends! Joseph, Rose, Bobby, Ted et al were all firm Catholics and no closed casket for private viewing and blessings and services prior to the televised version.