 Some of the background intercom chatter playing during the first  scenes shown of the television station that John Cassellis works at  is the same intercom chatter used in George Lucas (qv) student  film _Electronic Labyrinth THX 1138 4EB (1967)_ (qv).  Paul Golding (IV) (qv), who served as an editorial consultant for  this film, had also been a collaborator on some of Lucas other  student films.