When Mr. Nobley rescues Jane from the rainstorm by placing her on his horse during a torrential downpour, the rain is gone as they start to gallop away, the sun is shining, and everything is dry. Even with England's very changeable weather, this scenario would have been impossible.
During the first dinner scene, Jane is shown to be sitting opposite Mr.Nobley with a mirror behind her. After Jane stands up to leave the table, Mr, Nobley's reflection shows him standing up as well, only after her, not simultaneously as the scene shows.
During the final ball scene, where Mr Nobley and Jane Erstwhile dance together, there is a shot of the string ensemble in the background where the extra "playing" the violin is just waving the bow above the strings with a clear and visible gap between the two.