When Madame LaLaurie is first applying blood to her face, some of it is applied above her upper lip and below her bottom lip. As Louis enters the bedroom, that blood has disappeared.
Delphine Lalaurie is depicted as having had only three daughters. In real life she actually had four daughters and two sons.
At marker (0.11:28), The transom window above kitchen door reveals the set's unfinished wall framework.
The bird saved by Misty Day in a flashback is a Java finch. However, Java finches are native to Indonesia and do not live in the contiguous United States except as cage birds.
Pops Fountain is at the New Orleans Lake Ponchartrain lakefront, not in the French Quarter.