When Sally throws the poisoned milk out the window, most of the milk appears to go out the window, with only a small amount landing on the windowsill and none on the floor. When Geoffrey discovers the spilled milk, there is a large amount on the windowsill and an almost equal amount on the floor.
Ann Carter's hair appears with tighter curls and thus shorter in some of her later scenes in the film.
When Geoffrey and Cecily are holding hands, in the first shot they're looking at each other, then in the longer shot Geoffrey is looking away from her, and in the third shot they're looking at each other.
In the opening scene Colin Campbell/ MaGreagor is washing a plate then they cut to him and now the plate is a cup.
When Carroll's daughter runs from the window to her mother's room, she says "mother," but her lips never move.