The frog-jumping contest Henry/Henrietta is slated to enter in Calverton County smacks of the same excitement and importance for Jeff and Porky as if it were the historic, internationally renown frog-jumping contest in Calaveras County, CA, that has been held every year since 1928 on the third weekend of May, especially since this episode originally aired 3 June 1956, just two weeks after the actual contest that year had occurred.
When Ellen jokingly calls Henry/Henrietta the 'celebrated jumping frog of Calverton County', she's playing on the title to Mark Twain's short story "The Celebrated Jumping Frog of Calaveras County." The story was first published in 1865 and was the author's first real success, catapulting him into national prominence.
This is the seventeenth of nineteen appearances Richard Garland makes in the series, each time playing the role of Constable Clay Horton.