When David Blake is advising the young chess player, the arrangement of the chess pieces on the board changes between shots. Most notably, the impossible position of a white pawn on the a1 square (1st column, 1st row from white's perspective) is set up in the front shot, but not in the over-the-shoulder shot.
The corner of 77th Street and Narrows Ave in Bay Ridge does not have an apartment house on any corner, the intersection has private houses on each corner. Minor complaint from someone who lives in the area.