Dwayne Johnson said he tried hard to get Jason Momoa to play the role of Hobbs's brother, but scheduling issues prevented it from happening. However, Johnson gave fans hope for a future collaboration, adding, "Next Hobbs movie for sure." Vin Diesel then proceeded to go against Dwayne's plans by casting Momoa in Fast X as the sadistic, androgynous and flamboyant son of Fast Five's main villain, Hernan Reyes.
The idea of a "Fast & Furious" spin-off featuring Hobbs and Shaw first emerged during filming of The Fate of the Furious (2017), after producers and studio executives took note of the comedic chemistry between the two throughout their scenes together. Plans to actually develop the spin-off were informally green-lit towards the end of filming and they were later revealed to be the reason behind the much-discussed animosity that emerged between Vin Diesel and Dwayne Johnson in the final week of production, which resulted in Diesel reportedly canceling some of Johnson's scenes (which was within his purview as one of the movie's producers), and not showing up for filming at all on at least one day of production, leaving hundreds of cast and crew sitting idle. After news of the spin-off became public, co-stars Michelle Rodriguez (Letty Ortiz) and Tyrese Gibson (Roman Pearce) publicly criticized it for damaging the Fast & Furious "family", as well as pushing back the release of F9: The Fast Saga (2021) by at least a year. Johnson would subsequently quit the main franchise, opting not to return for the ninth, tenth and eleventh movies. He stated he still has plans to make Hobbs and Shaw 2, in which audiences would get to see his character "walk off into the sunset".
Deckard Shaw is about two years older than his sister Hattie. In reality, Jason Statham is twenty-one years older than Vanessa Kirby.
The exterior of the curved E.T.E.O.N. headquarters building is actually the McLaren Technology Centre, where the McLaren Formula 1 team is based. The building was added to a CGI landscape.
Screenwriter Chris Morgan said that a line spoken by Deckard Shaw to Hattie before E.T.E.O.N.'s assault in Samoa, "There's things I've done that I have to make amends for" was deliberately written in response to the viral Internet fan campaign called "Justice for Han". The campaign alludes to him killing Han at the end of Fast & Furious 6 (2013).