The Seven Soldiers of Victory, also known as Law's Legionnaires, first appeared in Leading Comics #1 (Winter 1941). As noted, the original members are Star-Spangled Kid, Stripesy, Vigilante, Shining Knight, Crimson Avenger, Green Arrow, and Speedy. Wing, Crimson Avenger's sidekick, fought with them but was never considered a member.
Green Arrow was part of the Seven Soldiers of Victory, Courtney refers to him as 'Robin Hood.'
Crimson Avenger and Wing are the oldest DCU characters to appear on Stargirl, having debuted in 1938 before Batman.
In the comics, Dragon King attempted to "upgrade" Cindy with more painful cybernetic enhancements and more intense training sessions every time she failed him. In this case, his punishment for her disobedience is a little less dark, but harsh nonetheless -- and speaks volumes about his parenting style. It is unclear how Cindy "killed" her mother, whether it was a complication from childbirth or his experiments on Cindy, but he obviously resents her for it and continues to take this out on her.
Unlike Cindy, Jordan doesn't appear to recognise Courtney as Stargirl when he sees her, despite the fact he saw Stargirl in broad daylight instead of at night and in the dark. Justified though in that he only saw Stargirl briefly, several weeks ago, and has likely forgotten what she looked like exactly, whereas Cindy had several weeks of regular contact with Courtney before seeing Stargirl and so was more likely to recognise her. Cindy also had the benefit of Pat calling out Courtney's name.