The inspirations for the film's costumes were Casablanca (1942) and Now, Voyager (1942), where the costumes combined both simplicity and beauty.
While in bed waiting for the phone to ring, Max is reading the book "Brighton Rock" by Graham Greene. The plot involves a crime lord planning to marry the only witness to his murder of a journalist, much like the general theme of the film on betrayal and double crossing. Graham Greene is also famous for "The Ministry of Fear", another spy thriller set in World War II, in which an ordinary person is mistaken for a German spy after winning a pie (which contains a microfilm with military secrets) in a raffle.
Rumors spread of an affair between Marion Cottilard and Brad Pitt during filming. None of it turned out to be true though, but Angelina Jolie filed for divorce from Brad Pitt soon after shooting ended.
This is Brad Pitt's fifth World War II movie, following Inglourious Basterds (2009), The Curious Case of Benjamin Button (2008), Beyond All Boundaries (2009) and Fury (2014).