Perry does not recognize Tragg's voice on the phone and Tragg says "Is this THE Perry Mason?"
Implausible story as to the important delivery by the Dr. A birth of a child to an incarcerated prisoner.
A social service person would be all over this and the Drs. method would not work. Also not clear how the postman could have delivered special delivery to Della. Another lawyer talks to Perry about the slimey rat race of criminal law and Perry says something about not running with the rats. The judge makes a comment about legal technicalities.