When Redford first arrives . . . .
. . . . at the apartment, he gets out of a cab with his suitcase and begins going up the stoop to enter the building. At the same time, a young man & woman come out of the building and walk down the stoop, during which Redford stares at them as if they just stepped out of a flying saucer from Mars (when in fact all they did was step out of the building). Why?
The young man & woman never show up in the movie again, but this confused me, because the attention Redford's character gave them in this scene suggested they were going to re-enter the plot at some point, but they never do.
Can anyone explain?