When doctor and nurse throw Susan at the bed, her hair and look is different than the one in the very next shot.
When woman is running from the killer who approaches her with a blanket, the corridor she is running through is changed between the shots.
When Dr. Saxon ties the tourniquet around Susan's arm, he doesn't tie it tight enough to stop blood.
When killer is approaching with a blanket to kill a woman, studio light behind him is obvious, because there is none in the shot where he makes a kill.
When the killer pulls the knife out from his wound, it's clean and has no blood on it.
When Suzy is at the typewriter, she does not notice the killer opening a door in front of her. Then the killer appears behind her. After he stabs her, he replaces paperwork into the typewriter with clean hands.