For this video recording of Furtwängler conducting Mozart’s Don Giovanni, produced by Paul Czinner, it has been reported that the sound track was recorded in sessions after the 1954 Salzburg Festival performances, and the visual part was done in October that year. Only the overture in which we see Furtwängler conducting was thought to be “authentic” for the occasion stated.
Placing the current DVD alongside the 1956 pamphlet about this video made in Eastman colour makes one nostalgic. We should be grateful for the existence of such an Opern-Film made before Furtwängler died shortly afterwards.
Wilhelm Furtwängler Journal 