John Hillerman portrays his usual role as Higgins as well as that of his half-brother, Elmo Ziller, who hails from Hondo, Texas. That Elmo Ziller is a Texan is no doubt an inside joke on behalf of Magnum's producers, because although the character of Higgins is well established as being British, Hillerman himself was born and raised in Texas. Several years before being cast as Higgins, he played Howard Johnson in the western spoof, Blazing Saddles (1974), well remembered for presenting Sheriff Bart with a "laurel and hearty handshake."
Gillian Dobb appears as the desk clerk at the Belvedere Club. She would later go on to have a reoccurring role as Agatha Chumley in several episodes throughout the rest of the series run.
This is the second appearance of Robin Dearden (Lexi Ziller) in the series. She first appeared as Mandy in Season 1 "No Need To Know" (1981).
Elmo Ziller (John Hillerman) is from Hondo, Texas, which is about 40 miles west of downtown San Antonio. The population of Hondo, when this episode aired, was around 6,000.