J. D. Cannon and Terry Carter would both later star together in McCloud.
The episode title is the chemical formula for nitroglycerin.
Howard Rodman, story editor for this episode and several others of the series, was later one of three screenplay writers for the Clint Eastwood film, Coogan's Bluff (1968), on which the series McCloud (1970) was based on, which would later feature J.D. Cannon and Terry Carter, again playing fellow New York City police officers.