An ambulance used lights and sirens while driving away with someone who was dead on arrival. Ambulances only use their lights and sirens for emergency purposes, and retrieving dead bodies is not an emergency.
When Carl answered the phone call from Verna the dial label showed the phone number (311) 555-2368. This same number was seen on several pay phones and phones in both Intertect and Mannix's office. This was a unique 12 digit number AT&T created for movies and television shows. It was seen every week in the opening credits of The Rockford Files.
At the time this episode aired, executions were not being performed in any states in the United States.