Loring Jr.'s sports car is a British-built Austin-Healey 3000 (produced 1959 through 1967).
At the end of the show, during the final chat in Perry's office, Raymond Burr does not appear as usual.
The use of initials was important in this episode. "O.K." was stressed throughout the show. At the end, Della was seen wearing a necklace with her initials, "DS."