'The Ring' and 'The Deputy'
Interestingly, while the on-screen credits acknowledge Harry Whittington as the author of the original material "The Ring" is based on, it didn't credit his novel "The Deputy" -- aka "Trouble Rides Tall" -- as the basis for the plot and characters, while the book's plot for the show's premiere episode "The Deputy," wasn't used at all, but was credited anyway for the character Marshall Dan Troop was based on.
Maybe Warners Brothers felt one plug was enough?
"I thought I told you to come alone."