In Paul and Lisa's house there is a Century of Light movie poster hanging in the living room. Century of Light (2011) is a documentary film also directed by Christopher Leps.
In the film, Sarah is staying at the Beverly Hilton Hotel, room 411. The scene was actually shot at the Beverly Hilton, but in room 758. 411 is a reference to associate producer Caitlin Dill's birthday, April 11th.