Bill Williams (Mike Preston) and Barbara Hale (Della Street) were real-life husband and wife. Their son, William Katt (The Greatest American Hero (1981)), was featured along with his mother in the Perry Mason made-for-TV movies in the late 1980s, playing Paul Drake Jr.
When Grace Keith said that her father's house had been valued at $100,000 in 1962, that would be the equivalent of well over a million dollars in 2023.
One of the few instances when the guilty party is Identified in the spectator-seating area and tries to flee, but is stopped by the bailiff guarding the door.