A photo of Guy Williams, the television star of "Zorro (1957)"and "Lost in Space (1965)," is seen on a book jacket as the photo of author 'Steven Gorman.'
First clear, legible appearance of "853 OKG" California license plate. [@ 39:23] Episode 1 had a very clear shot of the plate.
Sounds of the truck in the chase sequence clearly lifted from between 6 and 8 minutes of Duel (1971) , which was also produced by Universal.
The truck that attempts to run Rockford off the road is a Mack FL700L. F designated a cab over series and L designates a day cab (no sleeper).