Raymond Burr and Joyce Bulifant sat next to each other on the panel of Match Game (1973) for a week, beginning with the episode Episode #6.203 (1978).
Atypically for a Perry Mason episode, the courtroom scenes are a trial with twelve jurors present. Most episodes are set at preliminary hearings, with only the judge presiding.
One of the few cases where a witness is represented by counsel, the witness pleads the Fifth Amendment on the advice of counsel, and is granted immunity from prosecution by the DA's office. Immunity was a relatively new legal device at the time.
When Perry is in bed and the phone rings, you can see a "ghost" image pass across the left side of the screen. It is actually a policeman coming from behind a corner from the previous scene at a police station that was faded into Perry's bedroom scene.
Nancy Willis takes the Havenhurst Ave exit off the 101 Freeway.