Obviously fake lightning flashes twice near the end of the movie.
At the brewery, after getting informed by forensics that the killer wears tennis shoes, Wes reacts to the employees choice of shoes. Prior to this, only the audience knows that the killer wears sloppy casual sneakers, certainly not Wes. Tennis shoes are a long way off from canvas sneakers.
When Wes is in Becky's kitchen, offering him ice, the microphone dangles multiple times into the frame.
Despite shooting on location in New Orleans, not one person in this movie has a regional Louisiana, New Orleans, or Cajun accent.