In the original series, Usagi and Minako were the only ones who fell for Haruka, believing that she was a male.
This is the first episode of Sailor Moon Crystal with the new animation style.
Sailor Jupiter uses Jupiter Coconut Cyclone and Sailor Venus uses Venus Wink Chain Sword, two attacks they do not use in the original series.
In the original series, Hotaru Tomoe did not appear until the reappearance of Sailor Pluto (as Setsuna Meioh) and after the mystical Holy Grail was revealed and gained by Super Sailor Moon.
In the original series, Mugen Academy was never mentioned or suspected to be linked to the Daimon attacks or to be the headquarters of the Death Busters until very late in the Sailor Moon S arc.