Not all is well this summer between the American Friends of the Salzburg Festival and the festival itself. “Festival officials are miffed with the Friends over that group’s decision to present ‘The Salzburg Festival: A Short History,’ a new documentary by the British filmmaker Tony Palmer. The festival has disavowed the film, partly because of what festival directors consider Mr. Palmer’s overemphasized and sometimes inaccurate account of the festival’s intertwined relationship with the Nazis.”