Overview: "These Amazing Shadows" focuses on the National Film Registry, an eclectic collection of movies considered to be "culturally, historically or aesthetically significant" by the National Film Preservation Board. Included: clips from many of the films; remarks from Librarian of Congress James Billington; such directors as Barbara Kopple, Christopher Nolan, Rob Reiner, John Singleton and John Waters; such actors as Tim Roth, Debbie Reynolds and Zooey Deschanel; and film critics and historians.