This was Daniel Roebuck's first appearance on the show. He would appear several more times over the course of the series' run before he would become a permanent cast member as Cliff Lewis.
While out in the hallway talking to Doctor Shaw, Ben dials a number to see if he has any calls and refers to the other person as; Sarah. Sarah was also the name of the operator in The Andy Griffith Show.
When discussing a patient with pneumonia, the doctors refer to a patient as "Mr. Slone." Dick Van Dyke, who appeared in the first episode, started in his own murder mystery show, "Diagosis Murder," as Dr. Mark Slone.