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.
Gone Girl (2014)
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Directed by: David Fincher
Starring: Ben Affleck, Rosamund Pike, Neil Patrick Harris, Missi Pyle
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More mistakes in Gone Girl
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: Hollywood actress Reese Witherspoon was a fan of the novel and purchased the rights, intending to play the role of Amy herself. However, once David Fincher was attached as director, she opted to serve only as a producer, realizing she wasn't right for the role.
Answer: The city may have fluctuating trash days. Or more likely, the July 5th schedule wasn't the regular pick up day due to the July 4th holiday.