Based on the 2014 book "Churchill's Secret Warriors: The Explosive True Story of the Special Forces Desperadoes of WWII" by Damien Lewis.
Ian Fleming introduces himself, "Fleming. Ian Fleming." This is a nod to his fictional hero James Bond who, in many of the films in which he appears, introduces himself as "Bond. James Bond."
Henry Cavill plays the historical figure who inspired Ian Fleming's James Bond. Cavill has long been a fan favorite to play Bond on screen.
The actual Gus March-Phillips was killed in action eight months following the events in this movie.