The shaver was turned off when Christian went to check the weird sounds from outside, but when he returns, he finds it left on and turns it off.
When Barbara goes to pull the plug out of the telephone, the room she is entering is very dark, but in the next shot it's normally lit.
In the opening sequence the girl's back is to the hanging figure, unaware, throughout, until the camera cuts abruptly to her screaming, suddenly facing it full on, without reason, other than the unlikely possibility of telepathy and unseen Matrix moves on her part.