When Clara falls down the stairs, she drags herself to the doorstep, but in the very next shot we see her arrive at the doorstep again.
Clara's position on the fence changes from the shot she's put onto it, and the very next one where she is thrown from it.
Several times, when Neville Brand wield his scythe, you can clearly see the blade is made of rubber as it shakes and wobbles when he moves.
Manipulation of light is obvious through the whole movie.