Trivia: Kane Hodder, who had portrayed Jason in the previous four films featuring the character, was keen on reprising the role and had even been given a copy of the final script. However, Jason was subsequently recast, with Hodder claiming he had been kept out-of-the-loop as to why. This decision caused some backlash from "Friday the 13th" fans. Director Ronny Yu explained that while Hodder was wonderful in the role, he chose Ken Kirzinger for the part, as Kirzinger was slightly taller and broader than Hodder (thus giving more contrast with the much shorter Robert Englund as Freddy), and because he wanted a slightly different take on the character. (He felt that Hodder was somewhat too "aggressive", whereas he wanted Jason to be slower, smoother and more deliberate in how he was portrayed.) Though Hodder was disappointed and angry with the decision, he holds no grudge against Kirzinger, who had actually worked with him on the eighth film as a stunt-double.
Trivia: In several early drafts of the script, two twists were considered that would have connected the pasts of Freddy Kruger and Jason Vorhees. One considered twist was that Freddy either raped or had a consensual sexual encounter with Jason's mother, and as a result had unknowingly fathered Jason. Another twist considered was that Freddy had worked at Camp Crystal Lake in the past, and had either molested Jason as a child, or was somehow connected to his drowning, being a child murderer and potential sexual offender, thus giving Jason a motivation to track down and kill Freddy. Both ideas were eventually dropped, as producers felt they were too contrived and too dark for the film.
Trivia: Another potential ending suggested for this film involved Freddy and Jason awakening in Hell, Freddy had his arm back on and Jason's fingers had regenerated. They would proceed to face off for another fight only to be stopped by hooks and chains suddenly shooting out of everywhere and digging into their flesh. The movie would then end with Pinhead (from the "Hellraiser" series) coming out of the darkness and saying "Now what seems to be the problem?" This was eventually rejected as the director wasn't a fan of the Hellraiser franchise.
Trivia: The magazine ad that Freddy's glove pops out of reads "Hard as Steel Dream Nails". (00:28:40)
Trivia: At one point in time, a sequel titled "Freddy VS Jason VS Ash" was considered, which would have included Bruce Campbell's iconic cult-character "Ash" from the "Evil Dead" trilogy. This was partially inspired by several props from "Evil Dead II" (including the "Necronomicon" and "Death Dagger") being used in "Jason Goes to Hell" as an Easter-Egg. For a number of reasons (including legality issues over New Line not owning "Evil Dead" or the rights to the character Ash, and the decision to reboot the "Friday" and "Nightmare" franchises), the film never came to be, although it was eventually turned into a popular comic-book.
Trivia: The filmmakers found it too difficult to give the film a definitive "winner" in the fight of Freddy VS Jason, as they didn't want to alienate fans of either franchise. Thus, the decision was made to have Freddy appear to "win" the first fight taking place in the dream, while having Jason appear to "win" in the second fight taking place in the real world, before giving an ambiguous ending implying that both may have survived. However, several crew members (including director Ronny Yu) later stated that Freddy is the one who would most likely be called the "winner", given his massive power and that his goal of being "remembered" had been completed.
Trivia: The screenwriters (and several other cast and crew members) were strongly against the scene in which Freddy is called a "faggot" by the character Kia, feeling it could be hurtful for any LGBT fans or suporters who saw the film. The line wasn't in the original script, but was rather a spur-of-the-moment improv on-set.
Trivia: The film was in development for well over a decade, going through dozens of different screenwriters and scripts. Robert Shaye of New Line suggested that it may have had the highest number of drafts and writers working on it out of any film at the time. The producers felt that part of the issue in finding the right script is that many writers attempted to be "too creative" with the material, and fundamentally went against the core concepts and styles of the "Friday the 13th" and "Nightmare on Elm Street" franchises.