In the original series, Queen Beryl never found the Sailor Guardians' secret headquarters as they never had one.
Makoto was never hypnotized in the original anime.
Usagi, Rei, Minako and Makoto never visited Ami's apartment in the original series.
In the original series, Usagi did not have a nightmare about the obliterated ruins of the once prosperous Moon Kingdom, the Silver Millennium or her beloved Prince Endymion.