The hotel lobby the girls enjoy drinks in is a recycled set from the Witt/Thomas/Harris sitcom It's A Living. The set was used as Louise Lasser's character Maggie McBurney's house. In this episode it's painted and decorated in a tropical theme. The set would later be recycled again as Sophia and Dorothy's apartment in Brooklyn although it was redressed in a 1940s/50s motif painted in neutral colors.
Tom Villard (Rick) appeared again in another role as a former student of Dorothy's in season 7 (Rose: Portrait of a Woman).
Like the island that the girls vacation on, the "Santa Juanita" does not exist in real life. This was done most likely to avoid offending real-life Caribbean governments at the time.
Keys Luke was Master Po in the 1970's television series "Kung Fu".
Here, Rose admits to having once read Blanche's diary but in the next season, Rose gets very defensive when Blanche and Dorothy read her diary.