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 - chronological order
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.
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.