He tells Mac, "I went to middle school in Indiana. And one day, I woke up, and I lived in Los Angeles, and no one ever explained why."
He's referring to the earliest season of "Saved by the Bell," which was originally titled "Good Morning, Miss Bliss," a sitcom set in Indiana. That series included Zack, Screech, Lisa, and Mr. Belding. It was later retooled as "Saved by the Bell."