At the end of the game, when Magnum is running between second and third, yes see the shortstop in the background behind Magnum holding a softball. The next shot has the right fielder throwing the ball in towards the infield. There wouldn't be two softballs on the field of play while play was happening.
Robin Masters noted the Washington Senators baseball team went out of existence in 1969. In actuality, the Senators went out of existence after the 1971 season.