Plot hole: So the monsters must be blind because they cannot see the people, and yet they seem to know where objects are, so they can grab them or avoid them. If they use some type of sonar then they would be able to locate people as well.
A Quiet Place (2018)
2 plot holes
Directed by: John Krasinski
Starring: Emily Blunt, John Krasinski, Noah Jupe, Millicent Simmonds
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.
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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.
Evelyn: Your father will protect you. Your father will always protect you.
Trivia: Test screenings for this were next to impossible - John Krasinski played the monster in a motion capture suit, but the CGI wasn't completed so audiences kept laughing at him whenever he came on screen instead of being scared by the monster.
Question: The father seems to be a very scientific guy. But why hasn't he built some "sound-grenades" which they always carry around and throwing them away to distract the dangerous aliens when they are near? (for example loud toys, egg timers, etc.).
Answer: Possibly because it would be too dangerous. Most times an object like that could not be thrown far enough away to allow the family to escape, particularly in a panicked situation. A creature might be momentarily distracted, but would quickly zero in on them as very frightened children would probably be yelling, screaming, and crying.
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Suggested correction: The aliens also demonstrate the ability to run extremely fast, easily able to outmaneuver a slow-moving tank. They would most likely jump on the top of the tank or rip the treads off, considering they still are extremely strong. They would also quickly jump onto a helicopter and take it down. As for other vehicles such as jets or aircraft carriers, the aliens either would have attacked military bases or taken the fight out to sea in ships. Whatever the answer, that particular element of the aliens is a large amount of possibilities, not a mistake.
If a waterfall can disorientate them, so would a jet engine or gunfire.
Something they teach in the military is the "ghost walk" - how to move silently. As the newspaper cuttings suggest, the noise angle was known about while there were still working printing presses, so it must have been a slow event. And a helicopter gunship can engage from up to 1km away, that's a long jump.
Yeah, how does the military never tried to use loud and/or high sound to defeat them once they found that they hunt using the sound? But to be fair they seem to be everywhere, so maybe they attacked in very large numbers.
That's actually clever (assuming the aliens didn't rip everything apart before coordinated strikes). Have some jets fly at low speed and A10s behind light up the space.