The first and last words spoken by the Count are taken verbatim from the Alfred Hitchcock film Vertigo (1958). The first ones from the scene when Madeleine (Kim Novak) and Scottie (James Stewart) are visiting the redwood forest. The lines at the end are from the next scene, at Cypress Point.
The book that Diggle's nephew asks him to read is the children's book Catalina Magdalena Hoopensteiner Wallendiner Hogan Logan Bogan Was Her Name by Tedd Arnold.