Throughout Wizard of Odd, Dr. Doofenshmirtz is mistaken for a witch when he is really a warlock. The credits make fun of this by crossing out the witch part of his name.
Third episode of Phineas and Ferb to have just one plot.
In the beginning of the episode, as Candace begins to read and think about Jeremy there is music reference to the opening soundtrack of Shrek (2001).
Both animated film adaptations of newer The Wizard of Oz books by Roger S. Baum have had an actress from them guest star as a relative of the Flynn-Fletchers in another Phineas and Ferb episode. Jane Horrocks from Lion of Oz (2000) was in My Fair Goalie as Cousin Eliza Fletcher, and Megan Hilty from Legends of Oz: Dorothy's Return (2013) was in Candace's Big Day as Aunt Tiana Flynn.
Although This Episode Premiered In 2010 It Was Made In 2009 According To The Credits Also This Was The Last Episode To Be Made In 2009