The original premise of the series was about a trio of teenage musicians but later evolved into about teenage secret agents.
Was originally produced by Saban, but was temporarily shelved after season one because it was thought to be too close to Disney's Kim Possible (2002). Coincidentally, Disney later bought the rights to the series themselves.
WOOHP, the secret organization that the girls work for, stands for World Organization Of Human Protection.
Alex Huang was originally Shanghaiese before they made her Chinese/Kazakh.
WOOHP's head boss, Jerry Lewis, bears a striking resemblance to animated character, Alfred Pennyworth from various batman cartoon incarnations.