Torres mentions to Karev that, if he has nothing to do, that she has a femur surgery to do that afternoon. That same moment Arizona is trying to splint her broken femur.
We see archive footage from the pilot episode in the opening of the episode.
Every episode of the show is named after a famous song. "Flight" is the title of at least three songs: one by Anya Darlow, one by Tristam & Braken, and the last by Natalie Hawkins.