Revealing mistake: Throughout the dive boat interior scene - after they dive on the wreck - various hanging items are swinging around randomly to give the impression the boat is rocking on the water. However, none of the key light shadows - from the exterior sunlight - move at all, indicating the boat is entirely static in a studio.
Revealing mistake: John Kramer's chain first goes on the side of his stomach, and then it's on his backside... impossible, otherwise the chain would split him. (01:35:47)
Revealing mistake: Just as the first credits roll, when the cheerleaders dance, check the African American, Caucasian, and most noticeably, the Asian American people behind the team. They are blatant, creepy-looking, unrealistic CGI characters. (00:01:18)
Revealing mistake: More than once, when speaking to their robot doubles, it's obvious that both Charles and Elaine are actually just talking to nobody, given their mannerisms.
Revealing mistake: When the Minotaur is born, he doesn't cast a reflection on the building right next to him.
Revealing mistake: After Kristin tramples on the muffin, it should crumble/flatten, but it starts to inflate back into shape. (01:17:45)
Revealing mistake: Ariel swims underwater and opens a book with stiff and easy-to-flip pages that produce a flutter sound when turned. The paper should be either soggy, or with its pages stuck together or even dissolved, and in no case sound and look as if it were dry.
Revealing mistake: When the Barrys cross through the glass door, for a couple of shots, Young Barry's face is replaced with a non-realistic CGI face with features that don't match the face contour at all.
Revealing mistake: The dog may be trained to go down the hallway, looking for a treat, but not to encounter Henry and "act" like he is happy to see a family member who just returned from vacation. Instead of being excited to see Henry, the dog's body language is indicative of stress or discomfort - tail pointed down with no wagging, slight cowering posture, weight shifted backward, and he even starts to back away from Henry. When lying next to Henry, the dog tries to crawl over the side of the bed. (01:17:45 - 01:31:00)
Revealing mistake: While inside the tunnel in Rome, before the yellow Fiat makes a U-turn multiple skid marks from previous takes are visible. Though one might pressume that the marks were already there, they are at the same spot and have the same pattern as the skid marks that the cars make seconds later.
Revealing mistake: When Jason is getting stabbed to death, there's a quick 2-second shot showing him being stabbed repeatedly in the stomach, with part of his intestines hanging out. But if you pay close attention, there's no actual damage occurring with any of the stabs, revealing it's just an effect. Likely either a collapsible prop knife or a CGI knife being stabbed into him.
Revealing mistake: The airplane windows on both sides of the aisle are solid white ovals, with no variations to indicate the airplane is moving in the sky. (00:40:30)
Revealing mistake: When River and Eden are talking in front of the kitchen window, every other camera shift alternates between different backgrounds - still/blurred versus clear/actively snowing. The props are also different. (00:14:15)
Revealing mistake: Neither driver, Justine, nor passenger, Billy, were visible in the car when it got spun around by the Jeep. Even if both got bent over from the impact, the upper parts of their bodies should have been visible as they were both erect in their seats when the man opened the door to check on them. Also, the car doors were so smashed in that the man should not have been able to open the driver's door (at least not without some force or "Jaws of Life"). (00:19:25 - 00:19:57)
Revealing mistake: When Max is talking to his therapist on Zoom, you can see on the screen that he hasn't "joined audio" for the Zoom call, meaning that he shouldn't hear her and she shouldn't hear him if it was, in fact, a real Zoom call. (00:20:24)
Revealing mistake: There is a glimpse of a bench on the porch landing, roughly parallel to the steps where Jake is sitting with his back at about a 45° angle to the railing. Front views of Jake show the bench oddly angled upward as though it ascends like the steps. (00:38:10 - 00:39:12)
Revealing mistake: In the scene with Dante in his pink robe and pigtails, the dead guy next to him, you can see his nostrils flaring in one scene. (01:06:00)
Revealing mistake: Boyd brought Dr. Mackles to the location where he escaped the police hunt. Meanwhile, he rummaged through the rest of the place. In a closet, he found a newspaper with an article that talks about the evil South African CEO. In the first paragraph, because the rest is filler text about a completely unrelated topic (the answer about an inheritance question from the advice column of the Moneywatch website). (00:58:50)
Revealing mistake: The "horse" in the stall on the left has to be fake. With the exception of a barely visible half-blink, it does not move the slightest when the girl (while handling the reins) walks around its head, and a couple of girls are touching (pretending to be removing) the saddle. (00:29:25)
Revealing mistake: Vivian talks on the phone as she walks towards the camera. A couple walks behind her in the opposite direction. A bicyclist emerges from the left-center side of the screen and heads straight across the path, perpendicularly towards the couple. The bicyclist "disappears" behind Vivian, just before he reaches (crashes into) the couple, and the camera cuts to Carol. Seconds later, Vivian still walks towards the screen, and a different person walks where the couple was. (00:14:38)