Where does Prairie end up?
The final image of the show finds Prairie bathed in white light and saying "Homer" in a hopeful tone that suggests he could be in the room with her. But where is she? For one thing, we know that the space she's in looks very different from the blue-light, Magic-Eye-esque landscapes the show previously used to represent the afterlife. Perhaps she's moved on to a higher level, a light dimension that she's entered following the execution of the Five Movements? It looks bright there.
A bleaker option: she could be in a mental hospital. Honestly, that makes more sense to me and would set up multiple potential Season 2 plotlines. For one thing, Steve and the gang would want to break her out of the hospital. If she were medicated there, the show could further explore one of its favorite tropes: the negative consequences of unchecked medical experimentation. Also, scenes of her explaining her past life to a psychiatrist would again give the show a way to employ flashbacks in an inventive manner. Though, really, the "she's crazy" plot twist is about as frustrating as the "it's all a dream!" cliché. Let the magic be real!