This was one of the few times Sgt. Williams was seen in plainclothes.
The train station where Rita Hudson accepts delivery of $35,000 worth of imported diamonds and is subsequently kidnapped from in front of is the same exact train station that appeared the episode "Suicide" from May 1958.
Rita Hudson's vehicle is a dark colored 1958 Plymouth Plaza 4 door Sedan. The suspects are driving a two-tone gray 1958 Dodge Royal Lancer 4 door Hardtop. Dan Mathews is driving a dark colored 1958 Chrysler New Yorker 4 door Sedan. Sgt. Williams meets Mathews at the suspect's hideout, driving another 1958 Dodge Custom Royal Lancer 4 door Hardtop. Suspect Darrell's vehicle is a two-tone 1958 DeSoto Fireflite Convertible.