In Hitchcock's opening monologue he is holding his left hand up to his chest. There is a cut to a tighter shot and his hand is now at his side.
In the opening scene, Mr. Hollister said that the reason the back of the skeleton's skull was flat is because as a baby, the person was strapped to a cradle board before the skull had completely "calcified." This is incorrect. The sutures in an infant's skull "ossify," or turn to bone.