The first thirty times i saw the infamous ST bloopers, they were of such poor quality that it took a much cleaner print, and a 31st viewing, before I realised that Spock (from "The Naked Now") is "watching" Vina as an Orion (from "The Menagerie") in his little hooded viewer - and getting sweaty palms from doing so.
"The Naked Now" is a TNG episode. You mean "The Naked Time." (I keep coming across that mistake lately, and I find it strange. "The Naked Now" is a title that's total gibberish except as a reference to the episode it's a sequel/remake to, "The Naked Time" -- i.e. "It's 'The Naked Time' updated for 'Now'." So it seems to me it should be easy to remember which title is for the original and which is for the followup.)
Meanwhile, I have to question the use of "Viewmaster" as an analogy for the hooded viewers. A Viewmaster was a toy/device designed for viewing 3D images, a handheld stereoscopic viewer. The hooded viewers in TOS were not stereoscopic or handheld.