The film is based on the true story of Mohamedou Ould Salahi, whose tenuous connections to al-Qaeda resulted in his detention at Guantanamo Bay for 14 years without charge.
Tahar Rahim & Denis Ménochet previously collaborated in Mary Magdalene (2018).
Hollander tells Slahi that they will be suing Secretary of Defense Donald Rumsfeld. Jodie Foster appeared in The Silence of the Lambs (1991) with Scott Glenn, who also played Rumsfeld in W. (2008).
Nancy Hollander (Jodie Foster) recruits Teri Duncan (Shailene Woodley) to translate French. Foster is in fact quite fluent in French. She delivered her commencement address in French and has even appeared in a French language film (A Very Long Engagement (2004)).
Top-billed French actor Tahar Rahim - playing detained terrorist suspect Mohamedou Ould Slahi - ironically portrayed real-life FBI agent Ali Soufan charged with investigating the 9/11 terrorist threats in The Looming Tower (2018).
Civil rights lawyer Nancy Hollander (played here by Jodie Foster) has stated in an interview that she gasped when she first walked onto the 'Guantanamo' set for this movie, it was so eerily like the very place she'd conducted so many of her interviews with actual detainee Mohamedou Ould Slahi. Hollander also fielded numerous phone calls from the production team in their pursuit of accuracy for the interview line of questioning.
While inside the prison corridor, Benedict Cumberbatch picks up a book from the book tray called "The Testament", which was written by novelist John Grisham.
Detainee Mohamedou Ould Slahi (of the film's title) has stated that his treatment in Guantanamo was much more brutal and inhumane than portrayed in this movie.
Despite playing Americans, Benedict Cumberbatch and Matthew Marsh are British.
Former Secretary of Defense Donald Rumsfeld, who is frequently mentioned in the film, passed away a few months after the movie's premiere, while the film was still in wide release.
Despite playing a Mauritanian, Tahar Rahim is of Algerian descent.
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