John Blythe is often credited being in this but he was not part of the project. He does not appear in the Robert Lennard casting papers nor was he on any shortlist for any role
In PR and other cast lists the character that Patrick Allen plays is listed as playing Inner Party Official, but in production paperwork he is called Faber.
During filming, Jan Sterling was pregnant with her son Adams Douglas, so she was given a certificate by the crew proclaiming him to be an honorary member of the cast.