Continuity mistake: In the scene where Sara is introduced to Monsieur DeFarge and the girls in French, we can see Monsieur pull out a teacup as Miss Minchin crosses the desk to the other side of the room. However, when the camera cuts back to Sara, we see him pulling out the teacup again.
Continuity mistake: When Sara first goes into the attic, she starts to draw a circle around her with a piece of chalk. When she starts the circle, she starts drawing next to the candle. When she completes the circle, the candle is now inside the circle. If you look at the lines on the floor when she finishes, you can see that she did not go around the candle.