It consists almost entirely of J. Lee Thompson saying,"This was in the studio. On location. Studio. Location. Studio." The way he says "studio" is bouncing around in my head now after typing that. If he's not saying that, then he's describing what's onscreen and how great it is that such and such an actor did it that way. (yawn)

Not in any way reference quality, but octogenarian (and only about two years before his death), frail-voiced director J. Lee Thompson pulls it off quite nicely. He's prone to think the audience would particularly care, or couldn't guess, whether the current scene was shot in a set or on location, but in between he tells some interesting trivia and anecdotes - he even explains how the phony sea seen from the guns cave was made.