That’s what I hate about TV writers—too clever by half. The story is about Indiana’s misadventures in getting wrapped up in the whole mess, not that he actually saved the world from the Nazis. I think Spielberg was making a point about the folly of trying to play God, for good or for ill, and the irrelevance of human machinations in the face of divine power—all while spinning one hell of a yarn. In a way the BBT writers got the point, almost, and then lost it going for snark. The U-boat thing is an actual plot hole, and a very big one.
The extra 21 seconds show Indiana water skiing behind the submarine......