Al Pacino's first appearance in a television series or film.
ABC announced in March 1968 the show's cancellation. A month and a half later, because of improved Nielsen ratings, ABC announced that the show would return for the 1968-1969 season.
(Articles from New York Times, March 11, 1968, and April 30, 1968.)
Many cast members of Dark Shadows guest starred on N.Y.P.D. while both shows were produced in New York between 1967 and 1969.