Other mistake: The construction of a staircase does not require a large nail at the site shown on the steps. Furthermore when Emily snags her clothes basket on the stairs it lifts a small nail up. How did it grow into a 2 inch fat nail?
Other mistake: The officers working at the Smith Grove Sanitarium have "police" on their uniform patches. When Michael Myers was boarding the bus to be transported to a different sanitarium the bus had a Corrections Department decal. Since corrections officers run prisons and jails along with sanitariums, the uniform patches should have said corrections, not police.
Other mistake: Sister Irene digs father Burke out of his grave in a crisp white night gown but doesn't get any dirt on it.
Other mistake: For the most part we see Malorie floating in the boat going with the river. However, numerous times we see her rowing against the tide. Even blindfolded you would be able to tell you are rowing against the flow by the resistance on the paddles.
Other mistake: When Boyce and Ford are watching Chloe and the Nazi officer through the floorboards, the former are in the attic, the latter downstairs in the living room. Surely looking through the attic floorboards would only allow a view into one of the bedrooms. How then do Boyce and Ford manage to see down into the living room?
Other mistake: At the end of the movie Lorraine has to remind Elise that she helped her once, implying they haven't seen, or spoken since. When Elise first meets Josh in the 1st insidious she tells Josh that her and Lorraine have been friends for a long time, implying they talk or see each other regularly.
Suggested correction: That's debatable as the word "friend" does have to do with semantics. I have friends I have not spoken to in a long time, or speak with rarely, but still consider them friends due to our history. Others would say that's not a friend as that's not what they think of when they hear the word "friend." So it does depend on the individual person. It's also quite possible this is what they told Josh as the cover story for why she was contacted since they initially didn't want him to remember his past.
Other mistake: It isn't known if Rory was diagnosed with ASD, but some of his behaviors and the two classmates in school making a reference to his "Asperger's" indicate or suggest this is the case. While Rory may have been "faking" some mannerisms in hope that the two bullies would leave him alone, his (hyper) sensitivity to noise (sound) was displayed after school when a dog was barking at Rory. However, Rory did not put his hands over his ears in the ball field despite the loud gunshots close to his ears. (00:51:54)
Other mistake: Daphne's dad drops the Legitimate Tulip badge in front of her so she'll avoid getting hurt, but when we see him do that, he does it before the warning for the ball is heard and seemingly not looking at the danger (especially in the second shot, when he is peeking from the corner). So his action makes no sense. (00:16:55)
Other mistake: When Eddie is in his apartment and on the hunt for a new job, he uses his phone to text a contact while looking for work. His phone shows no signal meter. (00:23:10)
Other mistake: Although it was pouring rain, no rain came into her car when Deb opened the window. Similarly, the floor by the front door of the convenience store (gas station) stayed dry despite customers coming in during the ongoing heavy rainfall. (00:25:24)
Other mistake: Constantine is driving along a road and an big rig truck is heading for him head on. The truck honks and they both hit the brakes, stopping just a foot away from each other. But at the speed the truck was moving it could not have possibly stopped so quickly. It would have skidded into Constantine's car. (00:35:00)
Other mistake: After Steve slides open the middle window near Olivia, a small puff of air and some small waves of the right curtain panel can be seen, but not nearly as much or strong as would be expected. The left curtain panel was largely stationary. With the window completely open, the right and left panels of the thin curtains should be blowing inside the RV at an angle or even be flapping outside of the RV. (00:10:45)
Other mistake: A female bull shark has between 1-13 pups. The exact number in the movie is questionable (due to their speed), but appeared to be well over the maximum 13 and perhaps closer to double this amount. Classified as "other" instead of "factual" mistake because the mother shark's DNA was altered, which could possibly explain a higher number of pups per pregnancy. (01:03:20 - 01:06:40)
Other mistake: During the murder in the stairwell, an old woman opens her apartment door outward, and Varg kicks it shut. Apartment doors always open inward, as did Euronymous' apartment in the same building.
Suggested correction: Euronymous' apartment door opens outward into the hallway, at least in the final scene it does when he's trying to get away from Varg.
Other mistake: While "dead" Mike is bent over his car's engine, his left leg moves. (00:32:40)
Other mistake: The opening text crawl stated that Ellen Taper Leigh (Annie's mother) died on April 3rd, 2018. But after the family return home after her funeral, the screen on Annie's laptop is shown at one point, and the date is listed as 10/9/2017. (00:00:25 - 00:06:51)