Other mistake: Salma Hayek is shot and the bullet goes through her side, leaving an entry wound and an exit would on her body, but not on the nightie she's wearing, at least when she passes by the entrance mirror. (00:05:50)
Other mistake: After the sniper shot, the phone shows it's 5:45 am. That would mean the movie took place in the space of 5 hours (the phone with the bounty had the time at 12:45); unless her mother lived hours away from the apartment by car, there's no room for the events to unfold in such a timeframe. (01:04:10)
Other mistake: The blonde hair sticks out from a spot opposite to the one Everly dumped the corpse in. It should also be noted that after cleaning the bloodstain right by it's really hard to imagine she could have missed something so conspicuous. (00:42:25)