Maiara Walsh (Simone Sinclair) had a main role in the Disney Series Cory in the House which starred Kyle Massey. Christopher Massey, kyle's older brother, made an appearance in this episode has Super Jesus.
Ashley Fiolek (Robin) was born Deaf.
The episodes title references the 1882 painting, The Tree Of Forgiveness, by Edward Burne-Jones.
When John says "It's like painting a mustache on the Mona Lisa", he is referring to Marcel Duchamp's readymade painting "L.H.O.O.Q".