Actually, though I quibble with the amount of profanity, the manner of speaking is fairly accurate. You have to read some books written during the time to see how close the writers actually come to this style of speaking.
I have a family history written by a relative who received her schooling in the early 1900s. We would call the style a little stilted today, and she was much less formal in person, but it reflects how she was taught one 'should' properly relay information.
I can only wonder how the future population 125 years from now will communicate with one another; after all, they'll have great grandfathers who wore their caps backwards and their underwear outside their clothes. Even among the middle class youth it's in fashion to speak in the manner of a field slave. We can usually count on society slouching more as the decades roll on, can't we?
Don't even get me started on proper spelling.