Continuity mistake: The story takes place in 1901 and Rose is still shown as a toddler. She would have been a teenager by then.
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Suggested correction: That comment would be accurate if it did take place in 1901, but it did not. The final season (Season 9) took place between 1887 and 1890 and, if you notice, the Carter boys are roughly the same ages in this film that they were in the series. In 1901, both boys would be adults by now (most likely in their early 20s), the same as Rose being a teenager - but it was not 1901, but around 1890 in the film.
Revealing mistake: The outline of Divine's wig is obvious during the closeup when she's scolding her donkey at the beginning.