Corrected entry: Quinn gets her legs run over by a car. She is told that any overt exertion on her part will make her legs permanently irreparable. When she is possessed, the entity makes her smash her legs on posts to open up the cast around them, and when it tries to make her walk her legs are observed snapping. After the demonic problems of the film are resolved, the demon's actions in her body don't appear to have done any damage.

Insidious: Chapter 3 (2015)
1 corrected entry
Directed by: Leigh Whannell
Starring: Dermot Mulroney, Leigh Whannell, Stefanie Scott, Angus Sampson
Genres: Horror
Deliberate mistake: When Quinn is texting the boy next door, he responds too quickly for it to be real. She sends the "So you think I can stop traffic, huh?" text and gets a response within literally two seconds. She then sends the "Did I wake you up?" text and gets two responses within five seconds. Texts usually take several seconds (at least) to be delivered and opened, so even with great service and lightning-fast fingers, this is obviously far too quick.
Elise Rainier: Loving someone is just delayed pain, isn't it?
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Correction: We never actually see what happens to Quinn's legs after being saved. After she breaks the casts, she spends literally the rest of the film confined to a chair. So we don't know whether or not she suffered permanent damage based on what happened.