- Acting for Two:
- Mai Kanazawa voices Oka, the Lord of Pastimers, and the Student Council Vice-President.
- Megumi Toda voices Agrippa in addition to Andou-sensei in Episode 5, Higuchi-sensei's friend from college, and the Tennis Club advisor.
- Both Koichi-kun the android and the Student Council president of the all-boys school were voiced by Kaito Ishikawa.
- The Cast Showoff: Shuu Uchida, Fujiwara's voice actress, was actually born and raised in Australia, hence her character's Surprisingly Good English.
- Playing Against Type: Both Ryotaro Okiayu and Toshiyuki Morikawa are renowned for their portrayals of calm, cool and aloof handsome mature men of action, or at times psychopathically cold villains. So it boggles the mind when they somehow are cast as Maeda and Olivia's brother, respectively.
- Star-Making Role: For Hina Kino, Rika Nagae, and especially Konomi Kohara. Prior to Asobi Asobase, none of them had really starred in a significant role in any anime, if at all in the case of Rika Nagae, but their roles as the Pastimers launched them squarely into mainstream popularity.
Trivia / Asobi Asobase