Us folks in Washington state might be more familiar with it than a lot of Americans, as a local company makes a version of the treat under the name Aplets and Cotlets.
A classic Far Side comic had a group of triumphant hooting cavemen carrying an enormous carrot through a jungle, with the caption "Early vegetarians returning from the kill".
The Cocoanuts is technically the Marx's second film; they made a silent short called Humor Risk, which is now lost (one story is that Groucho himself hated the film so much he burned the negative.) There aren't too many details now about it, but they evidently didn't play their familiar characters. https://en.wikipedia.org/wiki/Humor_Risk
Evidently the original plan was to have the machines using the humans' brains to enhance computation power, which makes a lot more sense, but it got nixed by executive meddling.
A couple from pre-Internet days that I've always enjoyed: "How can you just lie there and accept Continental Drift?" -Charles Addams "How can you sleep knowing full well there are communists in the French government?!" -Bloom County
As the video says, it was Ellison's Outer Limits script "Soldier" that Ellison claimed was ripped off, not Must Scream. Cameron has always denied that he got the idea from Ellison, and it was the studio who settled and put the credit in the film.
A classic take on this idea is the book The Motel of the Mysteries, where future (human) archeologists carefully dig through the buried remains a typical twentieth century motel room and come to the conclusion it's the tomb of a king.
https://en.wikipedia.org/wiki/Humor_Risk
"How can you just lie there and accept Continental Drift?" -Charles Addams
"How can you sleep knowing full well there are communists in the French government?!" -Bloom County