Character mistake: In Greta's ending, she says that her sister Karin was taking pretty badly the news that "her boyfriend was accidentally shot in the chest." But the narration during the sniping scene said that "the bullet burst his cranium like it was a rotten watermelon being hit by a baseball bat" and "his practically decapitated body lies lifeless on the streets of Norwalk."
Character mistake: In the conversation in the hotel lobby, Rachel asks Ingmar if he can snipe at 450 feet, converting it as "183 meters." There must have been a mistake switching two digits around; 450 feet would be 138 meters, at most.