Marilyn's line, "Dismiss your vows, your feigned tears, your flattery / for where a heart is hard they make no battery" is from William Shakespeare's poem, Venus and Adonis.
Catherine Zeta-Jones was pregnant of her daughter Carys during the shooting of the movie, which was filmed immediately after Chicago, Zeta-Jones' Oscar vehicle.
A line from Herb's speech to Miles is inspired by the Gettysburg Address. Abraham Lincoln said "testing whether that nation, or any nation so conceived and so dedicated, can long endure." Herb said, "This firm cannot prosper... nor long endure..."
Joel Coen:
[Kubrick]
The "beeping" sound effects of Herb's medical equipment are taken directly from Stanley Kubrick's 2001: A Space Odyssey, specifically the radar sound effects of the Jupiter pods.