Before the release, there was a controversy because the character of the witness wears a hijab in the movie, which is not the case of the actual witness. So she sued the production and won, which is why the movie states at the end "Having the character of Samia wear a hijab is a stylistic choice that does not reflect the personal convictions of the person concerned".
For security reasons, all characters and their names are invented for this movie, even though the main characters are vaguely based on actual persons.
In the film, Jean speaks Arabic without speaking the language. Everything is done via phonetics.
After Boulevard Voltaire (2017), this was one of the first movies that dealt with the terrorist attacks in Paris.