 During the late 1950s, MGM shot most of its widescreen pictures in  CinemaScope or Panavision, but this movie was shot in Paramounts  VistaVision process. Two explanations have been given for this. One  is that the project started at Paramount and moved to MGM. Another  is that Alfred Hitchcock (I) (qv) had shot several previous films  at Paramount using VistaVision and preferred that process.