LORELAI: Everything about me repulses that man [Luke]. My coffee drinking, my eating habits. Remember when I called him Ranger Bob last week? He hated that!
Lorelai may be referring to Forest Ranger Bob Erickson (Jack De Mave) from the family television series Lassie, which follows the adventures of a long-coated collie dog, and aired from 1954 to 1973.
The show was inspired by the 1943 movie Lassie Come Home, about a dog who travels from Scotland to Yorkshire to be reunited with the boy she loves (Roddy McDowall), based on the 1940 novel of the same name by Eric Knight. Sequels followed, and so did appearances by Pal, the dog who played Lassie, at fairs and rodeos throughout the US in the 1950s. All the subsequent Lassies were played by Pal’s descendants, and like Pal, they were all male.
Ranger Bob was from the years between 1964 and 1970 where Lassie helped the US Forest Service, with Bob Erickson becoming part of the show in 1968 as one of Lassie’s carers. Ranger Bob worked alongside Forest Ranger Scott Turner (Jed Allen), but it would be perhaps too self-referential for Lorelai to call Luke “Ranger Scott”, as Luke is played by Scott Patterson. Calling Luke “Ranger Bob” may have been referencing his healthy outdoor lifestyle and love of camping.
Reruns of Lassie were shown on Nickelodeon from 1984 to 1996, and the show is still on American television today.