The first scene in which the audience is introduced to the main protagonist, Greville Wynne, was shot at Stoke Park - the same golf course that was used in the filming of the James Bond movie 'Goldfinger'
When Oleg Penkovsky discusses his plan to defect to the West with Greville Wynne, he mentions he would like to live in Montana. This is a nod to this movie, where Captain Borodin expresses his desire to live in Montana once the defection had taken place.