The segment "The Box" is the only one of the four segments that is not actually an original story by the women but is instead an adaptation of the Jack Ketchum story.
Danny Elfman's taxidermy cat Frisky makes a cameo in the segment "The Birthday Party" (when he is turned to be adjusted).
Directorial debut of musician and songwriter St. Vincent, who goes by her birth name Annie Clark for the film, and Jovanka Vuckovic.
The title of the film, XX, is a reference to the chromosomes that determine the genetic make up for a woman, a reference to the female dominant crew behind the production of these short films.
St. Vincent herself is not a big fan of horror films because they scare her too much, so her short film "The Birthday Party" is instead intended to be more of a black comedy than a horror story.