Great sites
Revealing: When Ami's chest is being drilled by the "drill-bra" at the end of the movie, you can see blood flowing from her chest, obviously because of the damage the drills are causing her. Yet, later, you can see absolutely no cuts or marks on her breasts or upper chest, where the drills were penetrating her skin. The skin is simply soaked with blood.
Plot hole: Ami's arm was sliced off, and the wound went untreated (you can tell it was not cauterized in later scenes) for a number of hours before it was stitched up. All this time, we see her loosing ludicrous amounts of blood. Yet, Miki looses her foot, and dies of blood loss only a few minutes later, despite her wound and blood loss being much less severe than Ami's. An inconsistency in the style done solely for dramatic purposes.
Deliberate "mistake": When Ami's school friend is killed, a short sword is stabbed into the top of her head. Less than a half-second later, we see her face is totally coated in blood, and she gurgles even more blood before dying. There simply has not been enough time for such a volume of blood to have dripped down her face.
Factual error: During Ami's first attempt at revenge, when she kills the mother (who is overlooking her dead son's head), she stabs the mother in the back of the head, making the knife exit through her mouth. Yet, for no apparent reason, we see intestines fall out of the mother's mouth, which makes absolutely no sense. The intestines are in the lower abdomen, not in the head/neck area. More than likely done for a stylized purpose, but still a mistake.
Revealing: Twice when you see someone with a slit-throat (the maid at Ryugi's home and then later on the guard that Ami kills), you can easily tell the slit-throat is just an appliance, as it is a bit bulky and sticks out slightly from the rest of the neck. Also, neither wound is bleeding, both simply have some blood painted on around the cut.
Factual error: Despite Ami having her hand dipped into boiling oil and deep-fried, her skin is relatively undamaged in later scenes. The implication is that her skin was saved by the fact that the batter which splashed onto it cooked, sparing her skin, but that is simply impossible, especially given how long her hand was held in the pot. Realistically, her skin should have suffered severe burns.






