Am I the only one who sees how Audrey's scenes tie in to what we witnessed in episode 18? I am surprised how almost no one else is talking about it. Audrey's scenes tie very well to the journey across universes we see in episode 18.
Let's see:
In Audrey's scenes we witness an Audrey who seems confused about herself. Not quite sure who she is or what is real.
Who does she remind you of? Laura, Cooper, and Diane when they are in the "Odessa" universe as Carrie, Richard, and Linda.
And what happens when Audrey realizes her reality isn't real? It goes black and she snaps back to her reality. An Audrey that doesn't look like the one we know. Straight hair, no makeup. Perhaps in an institution.
What we witnessed was an Audrey from one universe "dreaming" of herself in the other reality. Somewhat confused and losing sight of who she was before a sudden realization and snapping back to her reality, wherever it may be.
This gives the final scene hope. Laura's scream and the house going dark is much like when Audrey realized her reality at the bang bang bar with Charlie wasn't her reality and suddenly woke up.
Perhaps like Audrey, Laura snaps back and awakens right there on the steps of the Palmer household but in her reality, with Judy inside?
When the Arm repeats Charlies line of "Is this the story of the little girl down the lane?" it is Lynch's clue to us. The answer was in the Audrey's scenes. We witnessed someone traversing one reality to another to be an alternate version of them self before the Odessa scenes, with Audrey. And she was able to wake up. Which means Laura too can wake up. And perhaps that is what we witnessed at the very end giving hope to the battle against Judy.