Character Error The Sadist threatens Everly with sulfuric acid and battery acid. If he refers to Lead-acid batteries (car-battery) both are actually the same.
Continuity The Asian man on Everly's couch can't move, however, when her mom comes into the apartment, the blood drip from his mouth has been wiped away, despite Everly never having approached him after reentering the apartment.
Continuity Everly is clearly shot in her side while wearing a white nightie. However, in scenes afterwards, it is noticeable that there is no entrance hole nor an exit hole in the garment. Only blood can be seen where she had been shot.
Continuity Everly stabs Taiko with a katana : on the side view, we see the blade out at the center of his back (from up to down). On the back view, the blade is exactly in the heart. Also, when she's cutting him in half, it's the right part of the body, despite the fact the blade was in his heart.
Kate Hudson was attached to the project for a long time, but after the movie was stuck in development, she dropped out and Salma Hayek later got the job.
The screenplay for this film was featured in the 2010 Blacklist; a list of the "most liked" unmade scripts of the year.
Joe Lynch has stated many times on his podcast "The Movie Crypt", that the reason he wanted to shoot in Serbia was "because he wanted shoot somewhere foreign for a few months, like big time directors always claim to want to do."
According to "The Movie Crypt" podcast, the movie was shot in sequential order because of the chaos that happens in the room.
According to director Joe Lynch, the camera never leaves the apartment building.
When Maissey was saved and Apartment 157 was shown from down up to the supposed 6th floor, the shot only elevated 2 floors.
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