Trivia: Len Deighton, the author of the original novel, also published a series of cookery books and wrote and drew a weekly strip cartoon-style illustrated cooking guide in London's The Observer newspaper - titled 'Len Deighton's Cookstrip'. In the first kitchen scene, where Harry Palmer is making coffee, you can see one of these strips is pinned to the wooden post next to the table.
Trivia: Many years after the film's release, Michael Caine revealed that the studio wanted to cut the scene of Palmer cooking as they feared it would make audiences think that Palmer was gay.