Jerry refuses to let a man into his building, a man who turns out to be Phil, his neighbor from just down the hall. As Phil angrily shuts his door, we see that his apartment number is 5E. However, 5E is Newman's apartment.
We see Jerry (Jerry Seinfeld) leaning over the window frame to talk to Elaine (Julia Louis-Dreyfus) outside, however in future episodes we see his building has mosquito shades over the windows.
Elaine (Julia Louis-Dreyfus) is asked by George (Jason Alexander) is her boyfriend was a DC Comics superhero, Blue Arrow. Blue Arrow was not an actual superhero in the DC Comics, but Green Arrow was.
When Kramer bursts into Jerry's apartment to escape the bird, the door slams shut by itself.