Director Edgar Wright once parked his car in a parking garage, only to realise that, by complete coincidence, the car next to him had a stylised "BABY ON BOARD" sign, with Baby's (Ansel Elgort) face taken from the film's poster. Wright left a note on the car's windshield that read, "From the director of Baby Driver, I approve!!!", complete with his signature.
If you watch the film with headphones, every time Baby wears just one earbud you'll also hear his music in only that one ear.
The studio pressured Edgar Wright to cut the foot chase scene because the movie was starting to go over-budget. Wright deferred a portion of his directing fee to ensure the scene was completed.
The Mike Myers masks actually were supposed to be the masks of Michael Myers from the Halloween series but the producers were unable to obtain legal permission. Edgar Wright then reached out to the comedian Mike Myers about using masks of his likeness instead, who thought the scene was funny and gave his blessing. This is ironic because the original Michael Meyers masks were also masks obtained without getting the proper permission. John Carpenter bought a William Shatner/Captain Kirk mask from a Halloween store, and painted it white to give it a creepy look.
Joseph was written as a deaf African American man in his 80s. CJ Jones was the only performer to audition who is actually deaf. Edgar Wright said "I started auditioning other very good actors who were pretending to be deaf, it made me feel immediately uncomfortable."
Walter Hill: Provides the voice of the courtroom interpreter. Hill directed Caçador de Morte (1978), one of Edgar Wright's primary inspirations for this movie.
Edgar Wright: When Baby delivers a pizza, there is a closeup of Wright's finger pressing the doorbell button. Wright also is seen reflected in the music shop window during the first coffee run. Wright said on Twitter he was following the shot and planned to remove the reflection in post, but decided to leave it in.