Corrected entry: The Cartwright family's Ponderosa Ranch is located on a huge tract of land near Virginia City, Nevada, but in this episode only, the ranch is said to be in western Utah.
Corrected entry: About 3/4 of the way through the show, Ben takes the dog tags from two soldiers as proof they are ready to give up. The problem with this is the US Army didn't start using them until late 1906, and Bonanza is set in the 1860s.
Correction: In 1906, the circular aluminum disc was introduced for use by the U.S. Army (and then made mandatory in 1913.) However, at the time of the Civil War, soldiers in the Army would carry various forms of identification. However, Cartwright never calls them "dog tags", he says "name tags." And you can see they are made of paper, not engraved metal, to fit the time period.
Correction: Utah Territory was the name for the present-day states of Nevada and Utah.