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.
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.
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.
When Everly's mother and daughter arrive and Everly brings out the gift for her daughter, the scene switches camera angles several times between looking directly at her mother & daughter and a side view, showing all three actresses. In scenes facing the mother & daughter, the mother's right hand is beneath the sleeve of a sweater she has draped over her. When the camera shifts, the sleeve is no longer covering her hand, but between her arm & body, leaving her hand exposed. The camera sequence shows her hand covered, then visible, covered, visible, and on the 5th cut, once again facing the mother & Everly's daughter, as the daughter walks towards the camera, the mother can be seen pulling the sleeve off of her hand and placing it between her arm and body, indicating they filmed the scene twice, once from each angle- with the head-on shots first, then spliced the two cuts together, not catching that the actress playing the mother never put her her sweater sleeve back over hand after removing it.
Everly uses a heavy firearm to kill several people, and the huge bullet impacts send their bodies flying backwards - but she's never sent flying backwards by the gun's even greater recoil (compared to bullets it's not cushioned by air resistance).
The Sadist threatens Everly with sulfuric acid and battery acid. If he refers to Lead-acid batteries (car-battery) both are actually the same.