When Sydney and Lauren are paged at the hospital, the code on their pagers is 47911. 47 is a recurring theme in this, and other J.J. Abrams series, and is a prime number.
When Simon Walker is waiting for Jack on the bridge, he is looking at a building in the background. The name on it is Credit Dauphine, the same company that was Sydney's cover at SD-6.
The standard opening titles aren't used for this episode.