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I read the Book Of The New Sun Series a couple of years ago but hadn't made that connection!
I never forget a useless fact. To be fair, the author had some justification, since stories echoing in both directions between the past and the future was a central theme, but that was possibly the the least highbrow reference in the series ;-) That said, I most probably missed a few.
I'll go looking for the film on Youtube, at some point. Minor bucket list item.
Heard of it but never seen it. The review I saw, years ago, said it was a satirical-comedy horror (or attempt at one), with the two heads constantly arguing. Was it funny or cringe? All I know about it comes from that review (which I recall said Ray Milland played the racist, and he's always worth watching), which was just enough to recognise it when Gene Wolfe reused it in one of the Book of the New Sun novels.