Russian soldiers on the east side of the Berlin wall purposely disrupted filming by using mirrors to reflect sunlight into the cameras. The scene where Harry Palmer (Sir Michael Caine) walks to Checkpoint Charlie for the first time had to be filmed from a long distance for that reason.
Harry Saltzman offered Eva Renzi a lucrative 200,000-British Pounds-a-year contract (the same he had signed with Michael Caine), but Renzi refused. After this film, Universal put her under contract. But her aggressive outbursts and difficult attitude on her first Hollywood set stopped her promising international career before it had really begun.
Hallam (Hugh Burden) tells Palmer (Sir Michael Caine) that he was with "Monty in '45". The "Monty" that Hallam refers to was British General Bernard L. Montgomery.
The film was a critical and commercial disappointment upon release, although it made enough of a profit to permit a third Harry Palmer film, "Billion Dollar Brain", a year later.
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