When Jane is sick and Diana is leaning over her, from the side view Jane opens her eyes, but when she is shown from the front view in the next moment, her eyes are still closed.
When Mrs. Fairfax finds out that Mr. Rochester is coming home with a houseful of guests, and the staff gathers in the kitchen, the young actress that plays Adele turns and looks directly at the camera, smiles, and then turns to leave the scene.