Creator Erle Stanley Gardner introduces the Cool & Lam pilot episode on the Perry Mason office set. He wrote a total of 29 Cool & Lam novels under the name A. A. Fair. The pilot is based on his 1940 book "Turn on the Heat".
Margaret Field is actually billed Maggy Mahoney. She is Sally Field's mother.
According to Lee Goldberg's book "Unsold Television Pilots: 1955 through 1989", this pilot never aired on TV at the time it was produced.