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Continuity mistake: During the final battle, when Rick delivers the line "I really hate mummies!" and Evie responds with "Seems the feeling's mutual!" pay attention. In the first shot, Evie is about five feet behind Rick and is facing away from him, but when it cuts, she's suddenly standing right next to him (literally shoulder-to-shoulder), and is facing the same direction as he is.

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Deliberate mistake: There's a very strange editing error in the final fight between Rick and the Emperor. After the scene cuts to Alex waking up, it cuts back to the fight. The Emperor hits Rick with a right hook, and when the camera cuts to Rick reacting, his head understandably flops to the right. But then the Emperor hits Rick with another Right hook... and when the camera cuts to Rick's reaction, his head flops to the left, in complete defiance of physics.

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Revealing mistake: When the evil general is kicked into the gears and crushed, the second camera angle gives away the fact that the gears are actually nowhere near touching at all, and thus, the general is not actually being crushed. Obviously they wouldn't actually be touching because they wouldn't want to hurt the actor... but they could have picked a better camera angle that didn't give it away.

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Deliberate mistake: When the Dragon Emperor is controlling the elemental orbs in the final battle, Alex shoots them, surprising the Emperor, who turns and looks at him. Except if you pay attention, there's absolutely no way Alex would have been able to shoot the orbs from the angle he's at. He's standing directly behind the Emperor, so he would have had to have shot through him to hit the orbs. And you can see plain as day that the Emperor is not hit by any bullets. It's a cool visual, but it makes no sense.

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Continuity mistake: This mistake is somewhat abstract and subtle, so it can be hard to catch. When the Yeti arrive, at a few random points throughout the scene, the "density" of the falling snow changes instantly between cuts. Ex. When Evie helps Lin execute a spin-kick, in one shot there's a ton of snow in the air, but after a quick cut, there's suddenly significantly less snow in the air. It's clear that the fake snow wasn't necessarily being dropped at a 100% consistent rate from take to take during filming.

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Revealing mistake: When the Yeti arrive, the second soldier that is attacked is picked up and thrown into a doorway. When he lands, you can very briefly see the snow for a few feet on either side of him "pop up" in the wide shot, revealing he landed on a pad. The camera cuts to a different, closer angle after about 5 or 6 frames, so it can be hard to catch the first time, but if you know where to look, it's very obvious. (Slow motion can help, but is not required).

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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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