In the scene where Nurse Michelle Charters is in the room of deceased patient "Mrs. T. Richardson" and the door slams closed, the pillow on the bed is at the top of the bed. In the next scene where Nurse Charters looks at the bed, the pillow is at the bottom of the bed. In the third scene where Nurse Charters grabs the bed rail and tries to pull it away from the door, the pillow is again at the top of the bed.
When all the water valves break in the room (38m30s) it's implied that the room fills with water in less than twenty minutes when in reality it would take several hours to even reach waist-height.
Why would a convalescent home housing elderly and infirm patients - some of whom require wheelchairs - continue to operate in a multi-story building with none of the elevators in working order? Surely that would be a serious safety concern, if not an outright health code violation.
Scully puts two fingers on the neck of a deceased man, presumably to check his pulse. However, she places her fingers on the back of his neck, right behind the ear, nowhere near where a neck pulse should be taken.
At 12m 48s Scully makes a pathetic attempt at cardiopulmonary resuscitation (CPR). Chest compression need to be at least 2" deep to be effective, and cannot be done without putting your whole upper body mass into it (not just your hands and fingers like Scully is doing here).