Starting in this episode, Mamoru started calling Usagi "Usako" while Usagi referred to Mamoru as "Mamo-chan."
This episode marked the return of Tuxedo Mask to the series.
Crystal Tokyo was first mentioned in this episode.
First appearance of Chibiusa.
This episode shares many similarities with "Act 14 - Conclusion and Commencement, Petite Étrangere" from the Sailor Moon manga.