Flashback time! We hit up Serena's short stint at the Knightley School in Cornwall, and Serena is partying it up. There's a priceless cameo from Damian as her nerdy "tutor," but nothing beats the fact that Serena's 2007 jam is "Crank That." Nothing.
It's the first time we see Ben, Juliet's brother, out of his orange jumpsuit. He's Ben Donovan, a teacher who was fired for sleeping with a student, which coincides with Serena's departure from Knightley — which made everyone assume that Serena had been his jailbait lover. The real story, from S herself, was that she had fallen for Ben and pursued him, but he virtuously turned her down.