When Bill asks the rabbi what this all means. She responds that we need to "repair the world." This is a direct translation of the Hebrew term Tikkun Olam which is a central concept of Judaism, to do what can be done to repair or fix the world.
At the end of the movie, Bill and Janet are holding hands in the rain over a supposed copy of Walt Whitman's "Leaves of Grass, Selected Poems 1855- 1892, A New Edition, Edited by David Koplan". There's also a rough pencil portrait on the slip cover based on a similar steel engraving of Whitman. David Koplan is an executive producer for the movie, and this appears to have been printed for the film for a non-existent edition.