The title is a reference to Mary Poppins (1964). Mary Poppins was self described as "Practically perfect, in every way."
Julia Stiles (captive female) and Shawn Hatosy (Boyd) previously appeared together in A Guy Thing (2003) and Down to You (2000).
It's no mistake that the incidental music playing during the segment when Dexter and Boyd tranquilize each other sounds exactly like the Ted Nichols themes used during the Scooby and Shaggy goof segments in Scooby Doo, Where Are You! (1969).
Dexter says that "Prince Harry" likes Sonya (Maria Doyle Kennedy). Kennedy portrayed Queen Catherine of Aragon in The Tudors (2007), wife of King Henry VIII who was often called Prince Harry (prior to his reign) by Catherine.