I didn't watch it, or any of the subsiquent epesodes, give me deadwood, I am sure it is more accurate as far as cleanlyness and language goes.
These shows always seem to illistrate late 20th and 21st centuary attidudes, views, culture and sensabilities etc, always clean, much better educated then most would have been, and language used was nothing like the language used then.
I am old enough to have known two veterans of the American Civil War, when I was going to school, and numerous people of the same age and although the men could cuss out in the paddocks, one never heard a misplaced word when in the company of females. So they were different to the characters in 'Deadwood' in that respect although I must admit that Saturday night was bath night. I often suffered by being pressed against the sweaty bossoms of black clad aunts and other middle aged female relatives. Summer time the men would often strip to the waist for a good wash after a day's work, and there were wash basins and jugs in all the bedrooms and we children would have the job of emptying them in the mornings, so people did wash more often than once a week.
I'd say that the language used in the 1860s was much the same as that which educated people use today.
However, unlike in most Australian TV period pieces, the pioneers had enough sense to block the gaps in the walls of buildings to keep out the wind and rain.