Should be "much less". Just a quick edit for a similar term that has the entirely wrong meaning.none the less
Nonetheless (one word) = in spite of, "The pickles were poisoned, but tasty nonetheless"
Much Less (two words) = bridge between a bad thing and an even worse thing, "Who would even eat dill pickles, much less ones you knew were poisoned?"
A nitpick, I know, but it made my brain's gearbox grind until I figured out what the issue was.
Great update, I like being reminded of movies I didn't remember seeing until I see the movie poster. Speaking of, I'm genuinely surprised the poster for Mouse Detective was so.... basic.