The movie that David and Nate are watching on TV after Keith leaves is The Lady Vanishes (1938), Alfred Hitchcock's masterpiece about a woman who vanishes on a non-stop train ride through Eastern Europe reflecting the situation of Lisa's disappearance.
The only episode to include a death in the middle of the episode as well as in the opening teaser (multiple unrelated deaths resulted in a busy funeral schedule).
First appearance in the series by James Cromwell as George Sibley.
Frances Conroy and James Cromwell would later star together in season 2 of American Horror Story although the two don't share many scenes together.
(at around 13 mins) When Brenda compares the apartment complex to The Day of the Locust (1975), she is remembering the movie, not the novel. In the novel, the characters are living on different stories of a single building.