John Dilworth created the character of Dr. Zalost in Zagreb, Croatia. His name means "Sadness" in Croatian, as well as Serbian, Bosnian and Montenegrin.
It is the last episode to premiere in 2001.
This is a season 2 finale.
Originally this episode was aired on November 16, 2001 as the "Lost Episode" followed by the next season (which premiered on January 11, 2002), but they were forced with a rerun of the second season finale that premiered on the same day after the third season premiere and the "lost episode".
This lost episode was aired the same day when Harry Potter and the Sorcerer's Stone (2001) was released.