Steven Pasquale (Sean Garrity) & Peter Van Wagner (Dr. Feinberg) also worked together on episode 6.5, Shiny Objects (2014), of The Good Wife (2009), as Johnny Elfman & Carl Orff respectively.
The poem Tommy refers to is "Fog" by Carl Sandburg.
Guest star Kate Burton plays the wife of a character suffering from Alzheimer's. In Grey's Anatomy (2005), she played the mother of Meredith Grey who was suffering from a similar affliction.