Guest star John Carter (Captain Egerton) was this same season playing Lt. John Biddle on sister series Barnaby Jones (1973) (a role he played in 85 episodes spanning 1973 to 1980). This was Carter's sole appearance on Cannon. William Conrad as Frank Cannon guest starred in the premiere episode Requiem for a Son (1973).
The helicopter seen is a Hughes 500 (model 369) (which is now known as the McDonnell-Douglas MD530F) chartered from Western Helicopters.
Third and last time Martin Sheen guest starred on Cannon, and the first time he was not playing Cannon's friend Jerry Warton (whom Sheen played in two first season episodes).
The elevator Cannon takes has a 13th floor.