The partial license plate given by a witness for Cowboy Bill's vehicle is the number 24. The Ferg explains that Wyoming license plate numbers begin with a prefix number that designates the county in which the vehicle is registered and that his county, Absaroka, is number 24. However, Absaroka is a fictional county and doesn't exist. There are really only 23 counties in Wyoming.
Ryan Carlberg (Officer Fields) and Eve Gordon (Gloria Dodd) appear on this episode, and they have both appeared on the show Medium.