In the scene where Sarah is on the plane to go back to California, she buys a headset from the flight attendant. She hands her a 5 dollar bill and realizes Jonathans information is on it. You then the see the flight attendant hand that 5 dollar bill to another man as his change. As Sarah is thinking about what she saw, the angle of the camera changes and you see that same 5 dollar bill being handed to the same man as change....interesting!