What follows is (a slightly compacted version of) Alex Cox’s introduction to the Drag City reprint of Rudy Wurlitzer’s novel “Slow Fade,” which takes in the screenplay Wurlitzer wrote based on the novel (and his encounters with Sam Peckinpah). That screenplay, according to Wurlitzer, is now “in L.A. crouched in a waiting room.” Let’s hope film scum won’t keep it in limbo…