Other mistake: When Amy cuts Mr Collins' neck while they are having sex and Amy is underneath him, not a drop of blood falls on her hair. Before she climbs off the bed, we can see a ring around her neck, above it, no blood, and below it, buckets full of blood.

Gone Girl (2014)
1 other mistake
Directed by: David Fincher
Starring: Ben Affleck, Rosamund Pike, Neil Patrick Harris, Missi Pyle
Plot hole: SPOILER: When Amy comes back, doctors would have checked her non-existent head wound from the "abduction", from where she supposedly lost that much blood. That would and should have revealed all of Amy's lies.
Officer Jim Gilpin: You ever hear the expression the simplest answer is often the correct one?
Detective Rhonda Boney: Actually, I have never found that to be true.
Trivia: Tyler Perry was reportedly not aware of director David Fincher's body of work, and was cast without knowing Fincher was directing. Perry has stated that he likely wouldn't have taken the role if he knew about the darker work Fincher is generally involved in, but stated that he was glad he did take the role in the end.
Question: Why does Amy whack herself in the face with a hammer? Her plan is working at this point. She's achieved anonymity and escaped her life. What possible good could cover from hitting herself in the face with a hammer? (01:13:04)
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Answer: To my knowledge, the purpose of hitting herself was two-fold. First of all, a facial injury would support the idea that she was abused or in some sort of bad situation. And secondly, to help mildly alter her appearance, so she could blend in more. (Especially considering people were looking for her).
TedStixon