In the hanging scene in the kitchen, the killer throws the rope over a hook in the ceiling. It is obvious that rope is already threaded through the hook when the killer throws it.
During the hanging scene, the rope is repeatedly shown wrapped around the officers knuckles. With the last view of the rope in his hand it is shown only passing through the palm of his hand, which would only be possible if he had let the body down at some point.
In the hanging scene, the killer ties the rope to keep the body suspended, in doing this the rope goes slack, but the body does not drop.
Locker room scene where a girl is alone and undressing, wraps towel around her then takes off her panties and then walks to shower room. Then gets into shower with panties still on.
After a girl has her throat cut in the swimming pool, the water is still clear though the official presiding states that she was alive when the knife went in which is why she lost so much blood.
Dead girl's eyes flutter in one shot and and chest move's from inhaling in another.
During the hanging scene, the hook through which the rope is threaded is obviously too flimsy to support a body.