They finally settle on "Emily Cowles" for Ruth McDevitt's character in this episode and stick with it.
When Carl thumbs through a phone book for "kennels," the page is torn out but on the next page there's an ad for garage door owners. Alphabetically, that doesn't work out. Even if he was looking under "Guard Dogs" (which he also mentions) it still doesn't work since "gu" comes after "ga".
Why doesn't Carl have any pictures of the diablero? He took pictures of it at the jewelry exchange and the auction. But he doesn't show them to Rolling Thunder when he's trying to describe it.
You can see the dog killed by the diablero move as Carl takes its picture (in the second shot of the dog).
Kolchak: F. Scott Fitzgerald once wrote, "The rich are different than you and me." They sure are. They got more money. But there wasn't enough money in the world to save some of the members of Chicago's upper crust from a fiendish force so dark it can only be called diabolic.
Obnoxious Staffer: Quality...I could have shot that better with shoebox and a pinhole! To think I stayed here all night to develop...that!
Kolchak: Why don't you stay a little longer and develop a personality?
Kolchak: Dr. Temple, I seek information about Indians. Now, I don't know the difference between a Chippewa and a Chippendale...
Auctioneer: And your name is, sir?
Kolchak: Kol…worth. Carl Kolworth.
Auctioneer: Any relation to the Woolworths?
Kolchak: Distantly, yes. They dealt in wool, we dealt in coal.
Captain Baker: "Diablero"? Now what is that - an Italian sport car?
Kolchak: (closing narration) Those prized stones, worth millions, billions, over 300 years of treasure claimed by the Diablero, the crown jewels of Queen Elizabeth, the Star Sapphire of Nicholas the First, the Firestone Diamond of Bonaparte and Josephine, to name but a few. None of them have ever turned up in any market in this world. Only one thing remains. The detectives won't admit it, of course, but somewhere, locked deep in the evidence files of the Chicago Police Department, is a handful of black feathers.
Victor Jory is billed by character name.
Also known by the title "The Diablero".
The Joliet State College of Barbering
Described in the context of an ex-con, Carl is undoubtedly referring to the Illinois State Prison at Joliet. Like most correctional facilities, it provided vocational training in the hope that inmates with skills won't return to a life of crime. Presumably, Al Delgado learned barbering there.