It is revealed that Amethyst stayed in the ground 500 years too long, resulting in her being an "overcooked" and smaller version of what should have been a standard Quartz soldier like Jasper.
Peridot introduces significant world-building details, such as: [S2E24] Too Far
Peridot recording her thoughts on a tape recorder is a direct homage to Special Agent Dale Cooper from the show Twin Peaks . It is revealed that Amethyst stayed in the
She identifies the injectors at the Kindergarten as "Era 1" models. [S2E24] Too Far