The memorable line section points out that the wonderful town of Otis is just like Stepford. This is a reference to the 1975 movie "The Stepford Wives", which was directed by Bryan Forbes. The town of Stepford, Connecticut, is the true old American ideal; men work all day long and women are the perfect housewives, no-one and nothing stands out. The climax of the movie is reached when it turns out that all the women of Stepford are actually robots programmed to think about cleaning, laundry and gardening solely.
Grace mentions "The Manchurian Candidate" when she tells the team of the injection serum that has been used on the victims. It is a reference to an eponymous film starring Frank Sinatra, Laurence Harvey, Janet Leigh and Angela Lansbury. It was directed by John Frankenheimer in 1962. Harvey and Sinatra star as soldiers whose platoon disappeared during the Korean War. Harvey and Sinatra's characters return to civilian life, but both of them have been brainwashed, and Harvey's character has been programmed to act as an assassin who takes his orders from an enemy controller.