Trivia / Eye of the Needle

• California Doubling: The (fictional) Storm Island is portrayed by the Isle of Mull.
• Fake Nationality: Donald Sutherland plays a German spy pretending to be British, who speaks with a British accent, while Kate Nelligan plays an English housewife. Both actors are Canadian.
• Same Language Dub: Sutherland's German dialogue is noticeable looped by another actor.