(at around 1h 45 mins) The Paris subway station where John Wick meets the Bowery King and Winston is "Porte des Lilas". It's often seen in films, as this particular station has a disused platform that's still kept fully functional, so it can be rented to filmmakers who wish to shoot in the Paris subway without having to disrupt regular traffic.
(at around 3 mins) The scene at the beginning of the film in the desert was done without digital enhancement. The place where John Wick meets the Elder is an actual rock where Lawrence of Arabia (1962) was filmed.
Lance Reddick's final completed film role before his tragic passing on March 17, 2023, just one week before the film's release. This is not set to be his final appearance as the character, as he is confirmed to have filmed scenes for the Ballerina (2025) spin-off. At the premiere, Keanu Reeves and other stars of the film wore blue ribbons to honor the late Reddick. The filmmakers have confirmed that a dedication card to Reddick is to be added to the end of the credits.
(at around 2h 5 mins) According to director Chad Stahelski, the inspiration for the top-down action scene featuring the dragon's breath shotgun was from the video game The Hong Kong Massacre (2019).
(at around 25 mins) John Wick says only 380 words throughout the film. Almost a third of Wick's dialogue consists of just one word like, "Yeah". Chad Stahelski revealed that Wick doesn't have a lot of dialogue because "Mr. Reeves stripped out roughly half the dialogue written for his character in the initial script." The longest line of dialogue that Wick has is in a scene with Shimazu Koji where he says, "You and I left a good life behind a long time ago, my friend."