Trivia

Ready Player One, as in the book, pays homage to popular culture from various time periods, mainly the 1970s and 1980s but also extending to the 1990s, 2000s, and 2010s; reviewers have identified well over a hundred references to films, television shows, music, toys, video games, anime and comics from these eras. Cline did not have any issues with these copyrighted elements when he published the book, but was aware that securing all necessary rights would be a major obstacle for a film adaptation. This task was eventually made easier thanks to Spielberg's reputation in the film industry. Spielberg and producer Kristie Macosko Krieger spent several years securing the rights for the copyrighted elements used in the film long before filming began, knowing that some scenes would not be possible without certain copyrighted elements. In the end, Spielberg estimated that they managed to get about 80% of the copyrighted elements they desired, noting that in some cases, the filmmakers were able to secure rights for some but not all the characters they wanted. In negotiating with Warner Bros., they could not secure Close Encounters of the Third Kind from Columbia Pictures, despite the latter being one of Spielberg's first films as director. Blade Runner, which was integral to the plot of the book, was off-limits as Blade Runner 2049 was in production at the same time as Ready Player One; as a replacement, the creative team had the players play through the events of The Shining, which Spielberg was able to secure the rights to as an homage to his friend Stanley Kubrick. While Cline's original work heavily used the character of Ultraman, the rights over the character were still under legal dispute, requiring them to replace Ultraman with the titular robot from The Iron Giant and RX-78-2 Gundam. Spielberg recognized that his past films were a significant part of the 1980s popular culture cited in the book, and to avoid being accused of "vanity", he opted to remove many of the references to his own work. Cline stated that he believed Spielberg wanted to avoid self-references to films he directed, due to the criticism he received for his film 1941, which lampooned his own previous works Jaws and Duel. Cline said he had to convince Spielberg to include some iconic elements, such as the DeLorean time machine from Back to the Future, which Spielberg conceded as the film was one he produced rather than directed. Spielberg also allowed the Tyrannosaurus rex from his own Jurassic Park to be included. Cline also asked ILM to include a reference to Last Action Hero, one of Penn's first screenplays, without Penn's knowledge.

