Good coverage of Roger Corman' Fantastic Planet and Not of This Earth, plus a solid layout with lots of photos, makes issue 23 of Castle of Frankenstein a good read. Unfortunately, coverage of the Planet of the Apes series, which could have been better represented, is marred by yet another dislike-fest (so much bitterness in the 1970s, oh my) from Paul J. Wishninsky (nom de plume alert?). Edward Felipe soothes the burn with his article on George Pal's Doc Savage. Sort of. He doesn't cover the movie, just provides a good background to the pulp superhero who predated Superman.
Comic book reader version: Download Castle of Frankenstein No. 23 (and read more cool monster magazines from Zombos' Closet).