Jack the Giant Killer 1962 is a pretty good movie --as a Seventh Voyage rip off--what hurts it badly is the godawful model designs.
Isn't it amazing though-technology has reached a point where one could easily alter a film--do pretty much anything now. You can even swap actors from a movie. It was impossible 20 years ago but now you can. The trouble is there are so many choices you can make--it almost becomes pointless to do anything because you can alter it so far beyond the original restraints.
I am just fooling around here on a modest level (ten minutes of work) but one could do so much to change a film fx now.
It would be challenging and fun to restrict changes to what was technologically feasible in the era without making it obviously CGI.
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