2. The new interns camp out in the same tunnel as the Fab Five.
The Fab Five basically lived in this dreary corner of the hospital. In fact, "Glasses" is a perfect nod to George's endearingly clumsy character who also tripped after receiving a page in the pilot.

The scene where the new interns are shown running across the catwalk is a nod back to the pilot when the Fab Five did the exact same thing.