The three-legged dog shown at the beginning is played by a pit bull named Lucy, who also portrayed Champion on Parks and Recreation for the first time in The Comeback Kid (2012) and was featured in Fundraiser (2012), as one of the dogs Andy adopts.
Corazon (Corazón) is a Spanish word for "heart" and in the context of Christianity is a reference to the Immaculate Heart of Mary, which in Spanish is: "Immaculada Corazón de María."
This is the second appearance for Chris Butler (Professor Walker). The first was The Popular Kids (2005), when he played the smaller role of Deputy Harris.