Laurence Harvey received top / first billing, Tom Courtenay received second billing and Mia Farrow received third billing.
Debut credited English-language feature film of actor Calvin Lockhart who played the character of Brogue.
Final film of director Anthony Mann.
Principal photography production of this picture went over-schedule.
Reportedly, the marriage of actress Mia Farrow and Frank Sinatra was in decline during the production of this movie. Apparently, when the film went over schedule, Sinatra phoned everyday to order Farrow to come home.
The film's ending was directed by the Laurence Harvey who also directed some scenes shot in Berlin. Anthony Mann directed all of the scenes in Surrey and London as well as some of the Berlin scenes.
This movie was made and released about two years after writer Derek Marlowe's novel of the same name was first published in 1966. 'A Dandy in Aspic' was the first novel for author Marlowe.
This picture is a 1960s Cold War spy thriller and is also considered a Eurospy film.
Writer Derek Marlowe once said of actor Laurence Harvey's partial direction of this movie: "He directed his own mis-talent, changed it and the script - which is rather like Mona Lisa touching up her portrait while Leonardo is out of the room".