Other mistake: In Tiffany's converted garage, Tiffany says she's thinking of putting in a ballet bar, but there's one there already right next to the big mirror, where it's supposed to be.
Other mistake: When DeNiro is discussing a bet on a future (7 weeks away) game between the Eagles and Cowboys, DeNiro points out that the Eagles are favored by 1.5 points. In fact, betting lines are not set on games until the previous week's games are played, because there may be a major injury which would affect the line. As a bookmaker, DeNiro would certainly know this. And bookmakers are rarely fans of teams, and it would be unusual for a bookie to be such a rabid fan as DeNiro is in the movie.
Chosen answer: According to Wikipedia, excelsior is a Latin adjective meaning "higher" or "loftier", used in English as an interjection with a poetic meaning of "ever upward." The characters have a goal and are striving to achieve something lofty.
raywest ★