Towards the end of the film, Dr. Andrew Macpherson is shown at William's bedside. He reaches around the boy to embrace him, but when the camera angle changes, the doctor is suddenly no longer holding him.
As Peter and Catherine are reviewing the catalog, she turns over and puts away a page on the family's history twice between shots.
The sign at the train station says that it is 85 miles from New York, and 25 miles from Albany. But Albany and New York City are around 150 miles apart, not 110.