Craft Discussion about Literary Devices (Thought Experiment *NOT* fiction for critique)

I’ve been playing around with layering literary devices recently.. Red Herrings, MacGuffins, contrasting various conflicting tools as possible discussion provocateurs.. and ended up writing this li'l paragraph-long thought experiment. It’s not a draft or meant for critique or anything, simply device play and maybe some teaching. I’m curious to hear how some of you might interpret: the setup, what devices can be seen, and what you think the paragraph is trying to do. Any other elements that stand out to anyone as serving some purpose?
** NO CHEKHOVS WERE GUNS IN THE WEAVING OF THIS THOUGHT WEXBERIMENT **

Mr. McGuffin finds himself in an empty room that only contains a small, central end table, a door on either side (no knowledge of whether either door is locked or unlocked, however) and some objects resting upon the center table. A tiny desk lamp glows dully, casting a muted light on a single Sig Sauer P365 — not pertinent here, but Mr. McGuffin happened to notice that on the opposing wall, a fresh calendar hung open on January 1st; the year was not visible — next to which sits what appears to be the P365's magazine which clearly holds at least a single bullet inside. The only other visible artifact is just below the pistol but is hard to make out from his vantage point as the dim light doesn't quite fully illuminate it. Curiosity prompts Mr. McGuffin to approach and this reveals that the final item is a nondescript scrap of paper with a single word: "Chekhov..." however after the 'v' it seems as though it may have once contained more but it was just pale gray smudge at this juncture.