Like Keanu Reeves for the mainline series, Ana De Armas did most of her stunts, including using an actual flamethrower to (safely) burn a man alive on camera. She admitted in interviews that the first time she tested out the weapon, she broke down crying on set at the sight of setting a person on fire.
This film takes place between John Wick: Chapitre 3 - Parabellum (2019) and John Wick : Chapitre 4 (2023).
In real life Juliet Doherty, is a classical dancer/ballerina, like her character Tatiana.
Norman Reedus was in-between filming seasons one and two of The Walking Dead: Daryl Dixon (2023), so he had to keep the eponymous character's trademark hairstyle.