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: 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.
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.