Billed as a "documentary", much of the footage in this film is stock film and from film dramas not identified as such, so it's often impossible for the viewer to know if she's seeing Moe Berg or just a general illustration of what the narrator is describing. There are some interviews, mostly with the children of parties to some of the events--no Bergs because Moe Berg (who would never discuss his "spy" work, if any) and his siblings apparently left no issue--but most of the film is the recitation of facts (and speculation) better learned from Nicholas Dawidoff's exhaustive 1994 book "The Catcher was a Spy".
This is not the only "documentary" for which the lack of appropriate images and footage is a problem--until the fifties or even sixties there just isn't much which has been preserved--but it doesn't make it any more informative or easier to watch.