Trivia: Sister Princess
- Hey, It's That Voice!
- Dub!Yamada, played by Greg Ayres... who plays similar characters like Shinji Kazama, Jun Kitagawa, Leo Kakinoki, and Yuuya Asou.
- Tiffany Grant, who plays the part-German Haruka, is well-known as the voice of another part-German character, Asuka Langley Sohryu.
- Karen is played by the ever-childlike voice of Hilary Haag.
- Unintentional Period Piece: The show's general enthusiasm about and fascination with e-mail makes pins it firmly to the late nineties and early 2000s. Also, one episode has the girls very excited to have Rinrin's latest technological breakthrough—a handheld device that allows them to send e-mails wirelessly.