Throughout the entire movie, no one's name is ever mentioned and not a single character is ever referred to by any name. Characters are listed in the end credits by their roles in the story.
Jennifer Lawrence took a year off from making movies after working on this film, which she found very taxing.
Jennifer Lawrence described Michelle Pfeiffer's work in the film as her best performance and revealed that she forgot her lines during one scene when Pfeiffer was walking towards her because she was so taken with the color of her eyes.
This film's poster is a replica of the El bebé de Rosemary (1968) poster (horror directed by Roman Polanski).