When Lanyard is tying Gorlick up, the scarf he used for a gag was over Gorlick's mouth only. In the next scene, it was over both his nose and mouth. In the following scene, it was back over only his mouth. (These scenes started at approximately :30.)
Delia and Michael enter the room and Delia screams at what she sees, but the body is behind the desk and invisible from the door,