Some of the obvious things would be the various theatre marquees, the TKTS board, the statue of George M. Cohan. You could also go for other significant buildings (like the entrance to the Equity building) or architectural details (like the statues of Ethel Barrymore, Marilyn Miller, Mary Pickford, and Rosa Ponselle that were restored when the I. Miller building was renovated and Express moved into the ground floors), or certain types of people (like the flyer girls for Chicago in their character shoes and red tights).