Jack orders two Un-Colas, which is a name for 7up due to a highly successful ad campaign from the 70s and 80s.
Tori Lysdahl plays her second role on the series, as the con woman Rita. She also appeared in the January 1980 episode "Mighty Mouth" as Janet and Chrissy's gym trainer Shirley.
The title of this episode is a reference to Diamond Jim Brady who lived during the latter half of the 19th century and early 20th century and had a penchant for precious gems.
The song that Jack Tripper was imitating on the answering machine when he, Janet Wood, and Terri Alden were deciding what kind of message to leave for their callers is "THAT'S LIFE" by Frank Sinatra.
Actors Antony Ponzini (Tony) and Michael Alldredge (Sam) both guest-starred on "The Jeffersons," with Ponzini portraying a law enforcement officer, Secret Service Agent Neil, in the "George and Jimmy" episode and Alldredge portraying a villainous kidnapper in the "The Grand Opening: Parts 1 and 2" episodes. In this episode of "Three's Company," their roles have swapped: Ponzini portrayed a villain, the diamond thief Tony, and Alldredge portrayed a law enforcement officer, a detective named Sam.