The Flash Season 2: 28 Easter Eggs & References You Might've Missed
8. Johnny And Jesse Quick
Jesse Quick was expected to turn up at some stage of Season 2, with Violett Beane playing the speedster. While Jesse did appear, it was Wells, not Quick, and the transformation never happened, even after she was struck by the particle accelerator and ended up in a coma.
Even before then, though, the groundwork had been laid for it to happen, not least with Harry's nickname for her actually being Jesse Quick.
In Flash Back, when Barry's working on a formula to imcrease his speed, he's actually cracked it unknowingly. In a sense, anyway. In reverse, the formula reads 3X2(9YZ)4A, the formula Johnny Quick - Jesse's comic book father, and then Jesse - use to gain speed.