This is the first episode since the pilot that didn't center on one individual character for the flashbacks. Instead in this one we get flashbacks from Michael, Walt, Kate, Sawyer, Jack, Sun, Jin, Shannon, Boone and Sayid, all showing what each one was doing before they got on the plane.
In the flashback to Jack#s first meeting with Anna-Lucia at the airport they tell each other their seat numbers: Jack's is 23 and Anna-Lucia's is 42. Both numbers are in the set used in the hatch and that Hurley used to win the lottery.
In this episode it is said that Leslie's (Daniel Roebuck)last name is Arzt. Arzt is the German word for physician or doctor. In the previous episode he mentions that his character in fact has a doctor title - most likely for geography not for medicine as he works as a geography teacher.