The massive amounts of information Detective Tilson has always had at his fingertips throughout this series is finally explained: Tim has a photographic memory.
After looking at Detective Tilson's ID a suspect calls him Sergeant. He may have been promoted, but more likely the suspect didn't know that "detective" is an actual rank and just made a guess.
One of two episodes that Don Taylor not only directed but also acted in; the other was "Who Killed Marty Kelso?"
The Montrose Observatory is actually the Griffith Observatory, with a very obvious nameplate placed over the entrance.
Richard Carlson, Jane Greer, Stephen McNally, Gene Raymond, Don Taylor, and Ruta Lee all receive 'Special Guest Stars In Alphabetical Order' credits.