Factual error: Grain engulfment is not depicted in a scientific manner. It is not possible for engulfment to happen without a valve being opened at the base - which has not been shown in the movie when the boy falls in the grain storage. It is very unlikely that two engulfments will happen so close by in the same storage - if so, they will converge quickly. But, the movie shows both victims help each other one by one. They succeed in 5-10 seconds. Engulfment become entrapment in less than 20 seconds and require more than thrice the body weight to pull some one out (unlike one kid being able to pull other one out while both are on the grain). Finally, they both sit on the door and avoid entrapment.
Suggested correction: It's possible for grain to look sturdy but not be underneath so the engulfment could have possible. But you're right about them not being able to pull each other out.
Well observed. It's a factual error.
I jumped into grain hundreds of times. It is not possible without the grain moving underneath.
Factual error: Emily Blunt takes her blood pressure manually, pumping up a cuff but not listening to her pulse with a stethoscope to get the reading. Not possible without a new style automatic BP machine which would have made noise.
Suggested correction: This is simply not true. The style of BP monitor that she uses is the way all BP monitors used to work.
The way you use a manual BP cuff is by listening to your pulse with a stethoscope while you pressurize the cuff. Your top number is the pressure you hear your pulse stop, and the bottom number is the pressure where you hear it pick up again.
Suggested correction: It is possible to read the pressure by such a machine as shown in the movie after some practice. The needle or the indicating hand slightly skips when it reaches the read pressure range.
That's inaccurate. The pressure at which the gauge jumps is often different than the pressure at which the first Korsakoff sound is heard.
Suggested correction: You can watch the needle bounce with the pulse on any sphygmomanometer - not as accurate as with a stethoscope but would work just fine.
Factual error: Several shotgun mistakes in the final scene: 1) After firing the shotgun inside the room there should have been some smoke in the air. 2) She just shot the alien, so when she pumps the shotgun again it should eject an empty shell, but it does not. 3) The sound a loaded shotgun makes when you pump it is distinctly different from the sound an empty shotgun makes. It sounds like her shotgun is empty. 4) When the alien enters the cellar, the pump of the shotgun is pulled back. You never hear it racked forward before it is fired.
Factual error: The son's death happened in 2020 and it was day 89. On day 473, the mother writes in the calendar and it's Wednesday 3 October. So, the year must be 2021. But 3 October 2021 is not a Wednesday, but rather a Sunday. (00:26:00)
Suggested correction: It was October 23rd. And it's a Tuesday. The next October 23rd that's on a Tuesday is 2029. So still wrong but I'm curious as to how you got a year in the first place.
The year was on the memorial cross they left that shows 2016-2020. That's how the commenter got the year. As well I read others spotted dates on some of the newspaper clippings which wouldn't match the time frame.
Factual error: The kids take shelter in a truck and whilst the monster is distracted they release the brakes and it starts rolling down a hill. The brakes would have been seized up due to lack of use so the kids wouldn't have been able to release them in the first place.
Factual error: When the kid falls into the corn storage, he begins to sink instantly, just like his sister afterwards. When the alien creature attacks them, it's got no problem walking on the seeds despite its thin legs.
