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Continuity mistake: When Mad Dog is introduced, he delivers the line "Now Ricochet, he had his hands all over me girl!" In the first shot, he lifts both hands and points at Rick with both, but when it cuts, he's only pointing at him with his left hand, and then lifts his right hand up a second time.

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Revealing mistake: When Rick catches himself in the neck with the fish-hook, if you look closely when Rick pulls on it, it's pretty obvious that it's a prosthetic. Not only is the skin around the hook a lighter shade than the rest of his neck, but the way it stretches and wrinkles is completely unrealistic, giving it away as a small sheet of latex.

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Question: Is there any particular reason why Marco Beltrami didn't return to score this film? I understand he has a voice-over cameo during the movie, so he was obviously involved in some capacity. But why didn't he write the music? Was it a scheduling conflict? Did the directors simply want to bring in a new composer? Etc.

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Trivia: Originally, acclaimed director Rian Johnson was meant to have a cameo in the film as the director of the fictitious "Stab 8." He would have appeared alongside "Scream 4" co-star Hayden Panettiere as her character Kirby in a short scene. However, scheduling conflicts prevented this from happening. Nevertheless, a photo confirming that Kirby survived "Scream 4" is briefly shown, and Panettiere has a small voice-over cameo during the party scene alongside other cast and crew from the series.

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Trivia: There are tons of hidden voice cameos from former series cast/crew. Drew Barrymore provides the voice on the school loudspeaker. Matthew Lillard is the voice of "Ghostface" in "Stab 8." And during the party, Barrymore, Lillard, Adam Brody, Hayden Panettiere, Jamie Kennedy and Henry Winkler provide background voices, alongside series crew members Kevin Williamson, Marco Beltrami, Patrick Lussier and Julie Plec. Original director Wes Craven's widow Iya Craven also has a voice cameo at the party.

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Trivia: Due to being filmed during the COVID pandemic, the studio reportedly spent over $1 million on COVID tests for the cast and crew during production.

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Trivia: Series star Johnny Knoxville has stated this will be his final "Jackass" movie, and that he will be retiring from the franchise. He has cited his age as a factor, in addition to a severe brain injury he sustained during the film, which caused him to lose cognitive function and develop severe depression for a period of time. He also said that he feels he doesn't have anything left to prove after having worked on the franchise for over 20 years.

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Trivia: According to former "Jackass" co-star Bam Margera, the original working title for the film was "Jackass 4: We're Not Dunn Yet," as a darkly comedic reference and tribute to cast member Ryan Dunn, who passed away 2011. However, it has never been 100% confirmed whether this was an actual working title for the film, or if Bam was just making it up.

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Trivia: The original three "Jackass" movies were released four years apart each. By comparison, this fourth film was released 12 full years after the release of the third film, "Jackass 3D."

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Continuity mistake: When Yuan fights the Emperor, shortly after the Emperor realises she's mortal, she leaps towards him and twirls through the air. If you look close, her sword swaps hands between cuts when it connects with the Emperor's sword. First it's in her right hand, then her left hand, then it's back in her right hand. It looks like the left-hand shot was an alternate take of the shot right after, and they flipped it horizontally to create a "different camera angle" in editing, hence the hand-swap.

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Trivia: Future "Jackass" star Johnny Knoxville was actually Keanu Reeves' photo-doubled for the poster and promotional pictures, since Reeves wasn't available due to a packed schedule.

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Trivia: With this film, Jamie Lee Curtis has surpassed Donald Pleasance as the actor with the most on-screen performances in the franchise. Pleasance appeared as Dr. Loomis in "Halloween," "Halloween 2," "Halloween 4," "Halloween 5," and "Halloween: The Curse of Michael Myers." Curtis has appeared as Laurie Strode in "Halloween," "Halloween 2," "Halloween H20," "Halloween Resurrection," "Halloween (2018) " and "Halloween Kills," and will reprise the role again in 2022's "Halloween Ends."

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Trivia: SOME SPOILERS: Harold Ramis' daughter Violet got to visit the production a few times, and was even able to try on her father's original proton pack, which was being kept in storage. She has greatly praised the movie and the effects used to add her father into the film as a ghost, and feels he would have definitely approved of it.

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Trivia: The original Myers house was relocated in the 1980's to avoid demolition, and is currently being used as office rental space. The owners reportedly have no problem with people taking photos outside, but have had to occasionally put up signs politely but firmly asking people not to bother the tenants or approach the porch unless you are a renter there. Evidently overzealous movie fans have caused some annoyances for them over the years.

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Trivia: Original Michael Myers actor Nick Castle did shoot one scene as Michael, but it was cut from the theatrical release. (He appeared as Michael in a reflection in a bathroom mirror, similar to how he appeared as Michael in "Halloween (2018)" in a mirror-reflection).

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Trivia: Contrary to popular belief, the cameo from Dr. Loomis was not achieved through CGI. Turns out one of the crew-members (Tom Jones Jr.) actually looked a great deal like the late Donald Pleasance, who played Loomis. They simply threw some small prosthetic pieces and a hair-piece on him, and he looked virtually identical to Loomis in the original movie. He was then dubbed over in post-production by a voice actor doing a (pretty spot-on) impression of Pleasance.

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Trivia: Was originally meant to be filmed back-to-back with the third film, "Halloween Ends," but the idea was dropped due to scheduling conflicts.

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Trivia: "Halloween Kills" has a bizarre celebrity cameo hidden in it. In one scene, a yearbook photo of the character "Bob" from the original film is shown. However, the production crew couldn't find an actual high-school photo of the actor who played Bob in the original movie. Coincidentally, they happened to see a yearbook picture of actor/comedian Bob Odenkirk and realised that as a teenager, he looked just like the actor who played Bob. So the crew ended up using the photo of Odenkirk instead.

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Trivia: There are 12 jack-o-lanterns in the opening credits. Somewhat appropriate, as this is actually the 12th film in the overall franchise.

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I remember seeing a scene on TV in the 90's. In it, a man and woman were in a field either making out or having sex. One was on top of the other. But they were hit by something... it might have been lightning or just looked by lightning. The camera then focused on them, and they were sort-of "fused" and "melted" together, letting out these horrible moans and groans in pain. I thought it was from an episode of "The X-Files," but it might have been a different show or movie. Ring anyone's bell?

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