Although Hardeen is not shown as being as good a magician as brother Houdini, in reality he was just as good and created some of his brother's most famous illusions.
The episode title, "Paris Green" comes from the artists color paint which has a shade that can only be achieved through the addition of arsenic.
The scene set in the Chinese restaurant with Michael Shannon as Agent Van Alden is the first time the actor ever had his mother on set watching him on a movie set.