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.
A Quiet Place (2018)
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Directed by: John Krasinski
Starring: Emily Blunt, John Krasinski, Noah Jupe, Millicent Simmonds
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Marcus Abbott: You still love her, right?
Lee Abbott: Of course I do.
Marcus Abbott: You should tell her.
Trivia: At one point early in production, the film was going to be slightly retooled in order to make it the third entry in the "Cloverfield" franchise, following "Cloverfield" and "10 Cloverfield Lane." Eventually, this idea was dropped, and the movie was left as a stand-alone film.
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: 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.