from the red room scene in s3e2 i'm reminded of something i noticed the first time which i hadn't seen talked about: the laura palmer entity's left hand doesn't look like her hand. it may just be a fluke of the way things appear but to me it looks very purple and wrinkled and ancient, unlike her right hand which we see pull away her face. we see it quite up close because she hides her mouth while she's whispering to coop.
what's new about that which i learned tonight from a blog post is that right before she whispers to coop we hear a woman's voice faintly say "whisper" in a commanding tone. the blogger speculates that it is the voice of sarah palmer and having listened to it with my television at dangerously high volume (especially considering the high pitched screaming which follows very shortly afterward) i find this to be very plausible. [i considered the idea that it was a stagehand giving sheryl lee a timing prompt, but since the red room scenes are filmed backwards and the prompt should therefore appear after the whispering, i find that unlikely.] the blogger makes the argument that judy is controlling or possessing the laura palmer entity to some extent (thus a verbal command to trigger her actions), and i personally think that the weird look to her left hand may reveal that it is the part of her that is possessed. (noting by parallel that philip gerard is missing his left arm.)