Lipman's documentary contains interviews with some of the principals of the 1964 production; archive material, including out-takes, and tapes of production meetings involving Beckett, director Alan Schneider and cinematographer Boris Kaufman; interviews with other relevant figures, especially actor James Karen who both appeared briefly in Film and had been instrumental in recruiting Keaton, actress Billie Whitelaw famed for her interpretations of Beckett's stage roles, and Beckett's biographer James Knowlson.
For me, two personal highlights of the DVDs are the sound of Beckett's rarely recorded voice in the production meeting tapes, higher pitched than one might have expected; and the interviews with a frail but still luminous Whitelaw. One sweetly sentimental postscript to the 1964 shoot was that it resulted in an acclaimed appearance by Keaton at the Cannes Film Festival, his first at such an event, and only a few months before his death.
Strictly speaking, one of the two discs is the actual documentary Notfilm; the other is bonus material; but both are of equal interest and essential viewing. The producer is Milestone Film & Video (who, in parallel have also issued a restored version of Film itself).