@Knoxtnhorn lets keep the list going.
SPOILER WARNING!
Set aside for a moment how stupid the trap plan is. If the FBI really wanted to set a trap, they would go in UNDERCOVER. They actually do this at press conferences for murder investigations in case the offender shows up. I can guarantee they dont run around in FBI jackets and bring in the SWAT team and give a presentation to the venue staff beforehand.
If the wife wanted her husband looked into, why not just, uh, anonymously report him? Why concoct this convoluted receipt planting thing?
Why did Hartnett do ANYTHING? How the fuck were they actually going to catch him with their terribly conceived "trap?" Here's a profile: a psychopath would remain calm and cool until backed into a corner. The drastic, desperate move he pulls that involves kidnapping a celebrity AND confessing his crimes to her is hilarious.
I thought the acting all around was weirdly bad. Off chemistry between characters. Shots lingering a beat too long. Just a sloppy, rushed feel. I think M. Night's daughter wanted to cosplay a popstar and this was the best plot vehicle he could build for her.