Speaking to that retro feel, that may be in part because this centers on a Mind Flayer which is still a pretty esoteric monster. The Mind Flayer's squidy visage is still a flag for the true geek community.
Fantasy and Sci-fi is enjoying a golden age now with vampires, lycans, superheros, zombies, wizards and dragon mamas enjoying mainstream success. In 1974 I would wager that the majority of americans did not have a mental image of an Orc. Today you would have to be living on a Roc to not have a least a conception of an orc (yeah they might get it confused with a goblin or troll) but the Mind Flayer is still ours. But as the Dawn Breaks open the markets for speculative fiction a Twilight descends on what was once a Secret Circle of knowledge and learning. Under that Dome we knew what Tenser's floating disk was and we knew it had nothing to do with Disk World. Now though the main stream media is Staking a claim to the undead and the mystical, and twisting them away from the ideals held by the unwashed masses that could correctly pronounce acronyms like T.H.A.C.O. or G.U.R.P.S.. Some things are still pure though; the beholder, the rust monster, the displacer beast and of course the Mind Flayer.
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And until somebody writes a best selling book or movie about a sexy noble Mind Flayer who flatters a small town girl to ruin than we can keep some pure memories of rolling 20 sided dice in our garages. Perhaps that is why Mind Flayers are retro. Mind Flayers are still clean.