Frank's (William H. Macy) wheelchair is labeled "Property of County General", the hospital featured in ER (1994) also set in Chicago. William H. Macy had a recurring role as Dr. David Morgenstern in that series.
"Hiraeth" is a Welsh word which means a longing for a place and time or experience that no longer exists, a sort of nostalgic homesickness, especially for a Wales that no longer exists. It is sometimes used to mean homesickness.
Liam (Brenden Sims/Brenden Sims) is watching Rick and Morty (2013) after he opens the door for Frank (William H. Macy).