Yuko Mizutani, who was acting as Ikuko Tsukino in this series, passed away one day after this episode aired in Japan (May 17, 2016). She was aged 51.
In the original series, Cyprine and Ptilol attacked the Sailor Guardians by absorbing their attacks into their staffs and launching a powerful energy blast at them.
The Holy Grail is summoned by the three talismans coming together in the original series. Additionally, the talismans had nothing to do with the spirit of Sailor Saturn.
The Sailor Guardians were not forced to fight one another by the Witches 5 in the original anime.
Sailor Uranus, Sailor Neptune, and Sailor Pluto never fought Cyprine and Ptilol during the original Sailor Moon S arc.