Factual error: As the film itself notes, the major action starts in spring 1818 and continues for several weeks if not months. However, many of the trees remain leafless and the weather is nothing like the norm in spring and summertime Tennessee.
Factual error: The current era mother has a photograph of her ancestor Betsy Bell with the professor. In it, the two are the same age as shown in the rest of the film, set in 1817-18. However, photography of the sort shown wasn't possible until the 1840's at least.