This is the only time that Michael Ansara appears in the series, but he appears multiple times with David Janssen throughout his acting career. Their first appearance together occurs in Yankee Buccaneer (1952) where they are, as in this episode, on opposite sides of conflict.
This is the only time Bobby Diamond appears in the series, but he was a seasoned actor at this point, being perhaps best remembered for his starring role as Joey Newton in the quasi-western TV series Fury (1955).