Anjanette Comer was originally cast as Samantha Steel and even appeared in the publicity stills. But due to illness Comer had to back out and Eva Renzi ended up the role.
Average Shot Length = ~5.8 seconds. Median Shot Length = ~5.4 seconds.
Deadly enemies in the movie, Paul Hubschmid (Johnny Vulkan) and Eva Renzi (Samantha Steel), became a couple and married the following year.
Russian soldiers on the east side of the Berlin wall purposely disrupted filming by using mirrors to reflect sunlight into the film cameras. The scene where Harry Palmer walks to Checkpoint Charlie for the first time had to be filmed from a long distance for that reason.
Some sources say Max Adrian is in this film but he is not.
Trade screened to exhibitors on 15 November 1966.