The actors wore the same costumes for a decade.
From season 4 all the way to season 14 the primary cast members wore the exact same outfit every episode. This made for quicker shooting and easier editing outside of being an economical choice.
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Bonanza was one of the first shows to be shot in color.
In fact, Bonanza stayed on air in order to help RCA sell more of their new color televisions. NBC and RCA were affiliated at the time and had a symbiotic relationship.