Factual error: Though High Chaparral had a windmill and a water tower, there were no pipes to deliver water to the house - just a well that appeared in the yard only when called for in the script. They had plenty of eggs, but no chicken coops, and though Victoria always had fresh flowers in the house, we never saw a garden. We also never saw the ranch outhouse, but no surprise there: no one on TV in the 60s ever had a bathroom.
Deliberate mistake: Though it was, overall, far more historically accurate than most TV westerns, "High Chaparral" retained one anachronism throughout its run. For safety reasons, all the coal-oil lamps and lanterns on the set contained obvious electric light bulbs rather than burning wicks.