During the scene when Shaw shows off his collection of cars to Hobbs, he pauses on a Mini Cooper, saying that it was used during a mission in Italy; a clear joke on The Italian Job (2003), one of Jason Statham's previous hit movies.
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, Dwayne gave fans hope for a future collaboration, adding, "Next Hobbs movie for sure".
The idea of a "Fast & Furious" spin-off featuring Hobbs and Shaw first emerged during filming of "The Fate of the Furious," after producers and studios execs 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 executive 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) and Tyrese Gibson (Roman) publicly criticized it for damaging the F&F "family" as well as pushing back the release of the series' ninth installment by at least a year. As of February 2019, Johnson has stated he will "probably not" return for "Fast & Furious 9" but would consider it for the 10th in the series.
WWE superstar Roman Reigns (Joe Anoa'i) plays Luke Hobbs' (Dwayne Johnson's) brother in the film, but in reality they are cousins. Both Roman and Dwayne announced this on their respective Instagram pages.
Helen Mirren reprises her role from The Fate of the Furious (2017) as Shaw's mother. She originally landed the role after she had indicated her desire to be part of the franchise one day, and the producers were happy to accommodate her.
Idris Elba refused to say a scripted line for his character, calling himself "the black James Bond". He instead used the phrase "black Superman". Elba has been rumoured to be in consideration for the role of James Bond, and would be the first black actor to portray Bond.
Dwayne Johnson was very supportive of exploring the idea of Hobbs's family, allowing for many Polynesians to be cast as his relatives. This was a definite nod to Vin Diesel's constant references to "family" in the previous Fast & Furious movies.
Screenwriter Chris Morgan said that a line spoken by Deckard to Hattie before ETEON'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 and Furious 6.
At different points in the film, Dwayne Johnson (Hobbs) says he'll open up a can of whoop ass, and also refers to another character as an ass clown. Both of these statements were frequently uttered as catchphrases by Johnson's fellow wrestlers Steve Austin and Chris Jericho.
David Leitch has stated that the film would feel different from the "Fast and Furious" franchise. Although it was filled with action sequences, cars and elements that constructed "Fast and Furious", it would feel different from the series.
Deckard Shaw complains at the treatment of his mother in prison, saying "She's 71" ; the actress ( Helen Mirren ) had just turned 74 when the film was released, so would have been almost exactly 71 when the scene was shot.
During the London car chase, as Brixton's motorbike changes shape to slide under the oncoming truck, the iconic sound effect used during the transformations from the Transformers cartoons and films can clearly be heard.
Dwayne Johnson stated that Keanu Reeves was in talks to play the director of terrorist organization ETEON, if things had worked out: "What we did at the end was we left the ominous voice faceless. So, for some time, it was going to be a bit of a John Wick, all disguised. But then we left it there with a few people in mind. Originally, Keanu was the goal. We were talking, and it just didn't feel right creatively. He and I talked, and I totally got it. And it wound up being the best thing, so now we leave that open for the future."
The film's trailer indicates that Deckard Shaw (Jason Statham) is a former MI6 agent. This is a significant alteration from his original depiction in the "Fast & Furious" franchise (in "Furious 7") as a villain who originally served in the British special forces before his abilities as an asset became a liability. Retconning him as an MI6 operative puts him on a footing more akin to a James Bond-style spy, as most field operatives come from a special forces background and his status as a MI6 operative would not have been made common knowledge.
The car chase round London was mostly filmed in Glasgow city centre in late October 2018 and features the area around George Square and St Vincent Place, including scenes of them racing through the arches of the Glasgow City Chambers on the square. The roads were closed as the chase moves the wrong way down these one way streets.