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Film 860: Tinker Tailor Soldier Spy

Trivia: Michael Fassbender was originally cast as Ricki Tarr, but he had to back out because he was busy filming X-Men: First Class and was replaced by Tom Hardy.

To prepare for the role of George Smiley, Gary Oldman ate a lot of treacle sponge and custard to "put on a bit of middle-aged tummy". Oldman also watched Sir Alec Guinness's performance in Tinker Tailor Soldier Spy, and paid a visit to Smiley's creator John le Carré: "The way he touched his shirt, spoke and so on, I took all that and used it. I hope he won't mind, but Smiley is in his DNA."

Gary Oldman described Tomas Alfredson as taking a near-voyeuristic approach, by shooting with long lenses: "It was as if he was eavesdropping, like a peeping Tom, which is what you sort of want for a spy film."

Gary Oldman went to Old Focals, an eyeglass store in Pasadena, to search for the right glasses to fit George Smiley: "Glasses are funny things. For Smiley, they're iconic. It's like Bond's Aston Martin or vodka martini." Oldman tried on hundreds of glasses frames before he found the appropriate spectacles.

Connie Sachs' line about feeling "under-fucked" was allegedly originally spoken to John le Carré by W.H. Auden.

As this movie is about the uncovering of an infiltrator into the British Secret Service and the director's previous film was called 'Let the Right One In' [Let the Right One In], this film was jokingly referred to as 'Get the Wrong One Out'.