This was Richard Attenborough's final film as a director before his death on August 24, 2014 at the age of 90.
Construction workers of a demolition site in Belfast, where filming took place, were told to put the tearing down of the houses on hold and leave some standing for the shooting of this movie. The remainder of the houses were then blown up for the movie (for the effect of the bombs in World War II).
Stephen Amell's voice was later dubbed over after filming for his character, Teddy Gordon, had finished.
Features Mischa Barton's second nude scene. While she did take her clothes off in "The Oh In Ohio" the year before, she was lying on her stomach in a field and shot from a distance so she wasn't very visible onscreen. During an interview, she was asked what it was like to shoot her nude scene knowing her body (butt and breasts) would be very visible this time. She said, "It is a bit weird because you're naked in a room full of strangers, but I don't mind nudity as long as it's necessary to the story."
The B-17 used in this movie is the "Yankee Lady", owned and operated by the Yankee Air Museum of Ypsilanti, Michigan. This aircraft also appeared in Tora! Tora! Tora! (1970). The B-17 named "Sally B" also made an appearance in this movie.