(Image source: Universal Pictures)
The "Fast Saga" recently saw the release of "Welcome to the Family: The Explosive Story Behind Fast & Furious, the Blockbusters that Supercharged the World," a production history book detailing the genesis of each installment in the franchise. Among its revelations are behind-the-scenes insights into "Fast X," including the reasons behind director Justin Lin's abrupt departure just days into filming, despite having helmed "Fast & Furious" 3, 4, 5, 6, and 9.

(Image source: Universal Pictures)
According to author Barry Hertz's findings, Lin's sudden exit stemmed from escalating creative differences with star Vin Diesel and his producing sister, Samantha Vincent, ultimately reaching an impasse where no common ground could be found.
The primary point of contention between Lin and the production team revolved around the film's conclusion. One proposed ending would have revealed that Dom's son was, in fact, the biological child of the villain Dante. While some crew members saw this dark twist as a powerful way to reinforce Dom's unwavering commitment to family—showing he would go to any length for a child not his own, proving bloodline isn't the sole condition for family—others, including Diesel, disagreed with the approach.
(Image source: Universal Pictures)
The book also revealed extensive interference from Universal Pictures throughout the production, with the studio reportedly disliking Lin's original concept for the climactic action sequence. This sequence initially featured Dante rampaging in a massive, excavator-like machine. Second unit director Alexander Witt, interviewed for the book, described the proposed finale as "over the top," with the giant excavator serving as Dante's last resort, "eating cars like a 'Transformers' movie," a tone that ultimately felt mismatched with "Fast X."
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Furthermore, the book mentions that Oscar winner Jamie Foxx was initially slated to play the villain in "Fast X," with a post-credits scene in "F9" originally planned to set up his character. "F9" co-writer Daniel Casey disclosed that they had drafted up to eight different post-credits scenes for the ninth installment, some featuring various characters. However, considering Foxx's ethnicity, the villain he was intended to portray was likely not Dante but an entirely different character, one that ultimately did not progress and was scrapped entirely.