- Channel Hop: The film rights were bought in May 1966 and United Artists announced that Burt Lancaster would star in a film. Lancaster, however, pulled out and film rights reverted to Paramount, where it was made by the team of Basil Dearden and Michael Relph; it was their.
- Hostility on the Set: According to Oliver Reed's daughter Sarah, he and Diana Rigg didn't get on. "She was a strong woman, you see".
Trivia / The Assassination Bureau