- California Doubling: Some parts of the Netherlands doubled for Dunkirk, while the real town of Dunkirk was used as well.
- Dawson Casting: George is 17, while the actor who plays him, Barry Keoghan, was 23 at the time of filming.
- Doing It for the Art: In true Nolan tradition, he chose to shoot entirely in film rather than digital, going so far as to shoot entirely in 70mm film. (His previous films used 35mm film in some capacity.) He also opted to go for real naval destroyers for the battle scenes (rather than CGI).
- Dueling Works: With Darkest Hour as both films are based on the Dunkirk evacuation. However, while Dunkirk is focused on the soldiers who were evacuated from the town, Darkest Hour focuses on Prime Minister Winston Churchill during the events at home.
- Dyeing for Your Art: Much publicity came from Harry Styles cutting his long curly hair short for his role.
- Extremely Lengthy Creation: Nolan first had the idea for the film in 1992, but sat on it until he had experience making big-budget films (he took a similar approach with Inception, but without such a long interval). Production and post-production took a fairly typical length of time for a film of this scale.
- Fake Brit: Irishmen Cillian Murphy and Barry Keoghan both use English accents.
- Fake Nationality: Welsh actor Aneurin Barnard plays Gibson, a French soldier disguised as a British one.
- Fake Scot: Englishman Harry Styles portrays a Scottish soldier.
- Fan Nickname: The Shivering Soldier is often simply called "Cillian Murphy", as he's not given an actual name in the movie proper.
- He Also Did: After over a decade of exclusively directing sci-fi and superhero films, Nolan returned to more grounded and realistic territory with this film (indeed, being a reasonably historically accurate film based on real events it's his most realistic film so far). It also contains far less dialogue than his usual dialogue-heavy films.
- Production Posse:
- Christopher Nolan has worked with Cillian Murphy and Tom Hardy in The Dark Knight Trilogy and Inception. It is, however, his first film since Insomnia not to feature Michael Caine onscreennote . Nolan's uncle John also played in The Dark Knight Trilogy, and has a cameo in Dunkirk as the blind old man who welcomes and congratulates British soldiers after they make it home.
- Hans Zimmer does the music for the film, making this his sixth collaboration with Nolan.
- Hoyte van Hoytema returns as the cinematographer, having previously worked with Nolan on Interstellar.
- This marks the seventh time for both Lee Smith as an editor and Nathan Crowley as a production designer on Nolan's films.
- Nolan's wife Emma Thomas produces, as with the rest of his films.
- Star-Making Role: For newcomer Fionn Whitehead. Harry Styles is already known as one of One Direction's members, but Dunkirk is his first acting role. Barry Keoghan also rose to fame with this film, along with The Killing of a Sacred Deer.
- Stunt Casting: Nolan claims that he had no idea that Harry Styles was famous in another medium before he cast him, though whether you believe that is up to you.
- Uncredited Role: Michael Caine has a voice-only Cameo, which is uncredited.
- Voice-Only Cameo: As mentioned above, Christopher Nolan's regular collaborator Michael Caine is the radio operator who advises them
- What Could Have Been: Nolan initially wanted to make the film without an actual script, using the chronology of the evacuation to make up each scene on the spot.
Trivia / Dunkirk