The only time Tuxedo Mask is shown to have a transformation sequence within the entirety of the series including R, S, SuperS, and Stars.
The Silver Crystal made its first physical appearance in this episode.
This is the first time since the first episode in which Usagi does not introduce herself to the audience at the beginning of the episode.
Though Sailor Venus' civilian identity Minako Aino made a cameo appearance in the previous episode, she was formally introduced in this episode.
Usagi and Mamoru first discovered each others' secret identities in this episode, and Zoisite discovered the civilian identities of Sailor Moon and Tuxedo Mask.