Super Why! was originally developed in 1999 as a stop motion animated show. It was pitched to Nickelodeon but the network did not pick it up.
In Season 2, Pig's voice has matured severely. This was because his voice actor also matured.
Karen LeBlanc, who voices Princess Pea's mom in several episodes, also sings the theme song for another PBS Kids series, Cyberchase: A Corrida do Espaço (2002).
Princess Presto is the only main Super Why character to retain the same actress for the show's entire run and never be recast with a younger kid's voice.