In the 1st season, Poppy's twin brother, Edgar, saw the Scream Girls performing. But in the 3rd season, he didn't recognize them, and was meeting them for the 1st time.
In the 1st season, there were 2 villains: Dragos The Dancer and Poltergeist Pat. And even though Dragos redeemed himself, Poltergeist Pat was still a villain. But in the series finale, Home Is Where The Hauntleys Are, he made a cameo appearance at the end. Because of this, it's possible that he redeemed himself. However, it's unknown if it's true or not.