Although the background has become more abstract and modern, as befits the space age sixties, it still has plenty of color and style. Among the desert plants depicted are the stately Saguaro and the yucca.
The Acme company has expanded into the war surplus business in this episode, which was quite a common enterprise at the time of this short.
The name on the mailbox simply reads "Coyote" in this episode. The U.S. post box shown is accurate for the era.
Might have been a broad wink at the cartoon strip character Snoopy of "Peanuts," who was famously doing battle with the WW1 ace the Red Baron at the time.