476- 3359 was one of Cannon's personal phone numbers.

Frank Cannon was a pipe smoker. He was shown with a pipe in the first two seasons but it was seen occasionally in the third and fourth season before it was subsequently dropped altogether. In reality, William Conrad was a pipe smoker.

Season one's 25 episodes began with a short scene, before the opening credits, for a preview of what would be televised, that hour. Last four seasons and 96 episodes began normally with the opening credits, no preview of what would be seen.

The mobile number for the phone in Cannon's car was 213-191-9221.

In the main title and background music, the Cannon melody is usually played by the tuba and/or trombones as the composer (John Carl Parker) alludes to Frank Cannon's girth.