An episode from 1953, 'The Indian Show', has Ricky putting on an Indian show, inspired by his reading of American history.
How racist is this on a scale of Andrew Jackson to Birth of a Nation?
The episodes opens with Ricky reading a book with a look of blood having been "cuddled". He then says to Fred, "All those Indians you used to have in this country..."
Fred offers his impression of a Native American in order to audition for Ricky's show.
Later, Lucy reads to Ethel a bit of the book mentioning "their fiendish faces". Then unexpectedly at the door are two men dressed as Native Americans there to audition for Ricky. Lucy, having just read about Indian raids, is terrified they've come to scalp her. Incidentally, they don't seem to be played by Native Americans. In fact they're regular bit part players on the show. After knocking the poor guys out with vases, the confusion is cleared up Lucy feels silly for prejudging them so.
Then we're treated Ricky, Ethel and Fred rehearsing for the show with the number "Pass that Peace Pipe". A singer named Juanita (Cherokee name isn't it) does a duet with Ricky "By the Waters of the Minnetonka".
To be fair, the last sets up a great gag when Lucy secretly replaces Juanita on the opening. Ricky's expression when Lucy delivers her first line.