- I Knew It: From the beginning, it was thought that Kazumi was a witch that was turned back into a magical girl. Chapter 13 reveals that Kazumi is basically a witch stuffed into a cloned magical girl body.
- Teasing Creator: In the writer's Q&A from the first volume, the writer gets away with spilling a future plot point by wording it as a Suspiciously Specific Denial.
Q: Where's Kyubey?A: Huh? What is this "Kyubey" again...?Editor: Hey...wait...don't go giving away spoilers, please...
- What Could Have Been: The author's notes in the final volume reveals that Mirai's magic was originally going to be "stealth" and Yuuri was initially named "Lamia".