When Kriezler meets Dr. Ignatius Blunt at St. Elizabeth's Hospital, they converse in the corridor. During the conversation there are several people who walk by but from opposing camera angles, there is no continuity of these passersby during the conversation.
When Kriezler and Moore are stopped in their tracks in Dury's barn, it is because Dury has thrown a pole which lands embedded in the ground just in front of them. In the following shots the pole is missing from the scene.
Dury's home in Newton is depicted as a rustic farm in a rural area. In the 1890s, however, Newton was a streetcar suburb of Boston.
Sara was shown getting off a Paddlewheel steamer at a dock labeled New Paltz. However, New Paltz is significantly in-land from the Hudson River. The only river in New Paltz is the Wallkill Kama which is not navigable.
The woman Sara meets in New Paltz mispronounces Shawangunks.
A character refers to "John Hopkins". The university is in fact called Johns Hopkins, but this is a common mistake.
In establishing shot depicts Kreizeler and Moore walking through deeply wooded mountainous wilderness. However, Newton was a suburb bordering Boston and is located in the coastal plain of Massachusetts Bay.