Dark City, Descartes, and Narrative Doubts

Over the long Labor Day weekend, my partner and wife-to-be and I watched the movie Dark City, for her first time and for perhaps my twentieth viewing.  After seeing it in the theater when it came out in 1998, I've shown it in various Philosophy classes, and I've watched it on my own a number of times to enjoy again its semi-noir, moody, dimlit setting, its decent and entertaining play both with some philosophical concepts (or perhaps, rather, tropes), its reliably good though not outstanding ...