(at around 29 mins) Frank and Freddy are discussing over the slaying of the pigs, Freddy hitting the table while he speaks was unscripted, actor Reg E. Cathey improvised and thought it'll help settle the mood better, therefore Kevin Spacey's reaction was fully natural.
Meechum gives Frank cufflinks as a birthday present, which contain the letters F & U. FU was the nickname for Urquhart in the original House of Cards (1990).
When Robin is looking at the leaflet of Doctors names, a Dr. Wade and a Dr. Thomas are listed - these appear to be attributed to the names in the title of the production company Wade / Thomas Productions.
The episode won an Emmy Award for Outstanding Sound Mixing for a Comedy or Drama Series (One Hour).