At the moment SCRIPT has a short essay on Synecdoche, New York. Gary J. Shipley is taking a look at the film/script from a philosophical angle - references to E. M. Cioran, Martin Heidegger, Dasein and Paul Celan. If those names activate your mental light bulbs, this one's for you. Here's an excerpt:

There can be no resolution to Caden's play because there can be no resolution to Caden's life or, by extension, any life. In the film, resolution -- not even a fleeting approximation of itself -- is nothing more than nullification, nothing more than death. Whereas the filmscript curtails Caden's revelation with the accelerated blackening of a screen, the film makes the same curtailment with a gradual fade to white, Caden's death-cue being issued at the precise moment that he ceases to be visible. In both cases, though, Caden appears inseparable from the medium: he ends when they end. (Source)