The mouth area is a bit indistinct in the generated copies. However the area around the mouth does contain valuable information. Once the contrast is boosted on the stills they can be aligned so that the mouth remains stabilized. When the film is then run, a “cinematic effect” occurs. In other words, the previous image is still in the mind when the next image is being shown. This produces a cumulative effect of all the frames and the effect is that the mouth can be seen to move. Here is a collection of the stills that are used in the animated sequence. All but two are taken from a multi-gen copy of the film. One frame is from a transparency provided by Patricia Patterson. Another frame is from 323 of an Argosy article about the film from November 1968. Right click on the images for animation and enlargement.