Goofs

The blonde girl having sex with Niki is shown wearing dark stockings. As the scene meets an awkward turn however, the blonde's legs are bare and then her stockings reappear in the next shots (Uncut version).

The toy Niki grabbed from Akemi's backpack is shown being destroyed in one scene, but a day and several scenes later, the toy is shown again completely undamaged.

Towards her death, the nurse character is shown wearing only a torn gown hanging off her shoulders, but as she is dying the gown has disappeared completely and without reason.

While the demon has the nurse in his possession he soon shoves both her hands into the wall of the hospital room they are in. This is practically impossible as the wall was lined with thick tile resting over an even thicker amount of drywall, meaning that her hands would not have penetrate the wall in the slightest.

The girls tormenting Niki were apparently hiding out in the school's gym equipment room, as in on school grounds. All seven of the girls are horribly and inhumanly mutilated in that very room (one of which was reduced to a skeleton), but the next day school is still open and the students make no reference to the event.