Mireille Enos (Isobel) and Veronique Enos (Lily) are real life sisters. Mireille attended college with Kevin Rahm (Peter).
Photographer Roe Ethridge supplied the bird photographs that are featured heavily in the movie. Roe has work in the Tate Modern in London and at the Moma in New York. Maria Schiker supplied the art in Isobel's apartment, and sculptor and designer Erica Rosenfeld was the body double for Lily