Continuity mistake: This mistake is apparent after watching A Quiet Place 2. At the start of the movie when the family are at the store, a New York Post is visible on the newsstand with the headline "It's Sound." This would suggest that the invasion didn't hit the town immediately and that they had time to have newspaper deliveries and actually put them on sale. However, in the second film, it was evident that civilisation was pretty much destroyed on day one.
A Quiet Place (2018)
1 continuity mistake
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.
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: If the waterfall prevents the creatures hearing them, why not live there?
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.