Other mistake: In the scene where Fanny Price is caught in the rain, she drops apples from her basket. When she is collecting them from the ground she puts the apples back in the basket, except sometimes she doesn't actually pick up an apple. Clearly, she only pretends to put apples back.
Fanny Price: Well, Lady Bertram is always suffering near-fatal fatigue.
Susan Price: From what?
Fanny Price: Usually from embroidering something of little use and no beauty... not to mention a healthy dose of opium every day.
Susan Price: Your tongue is sharper than a guillotine, Fanny.
Fanny Price: The effect of education, I suppose.