Danny's aunt Clara is played by Helen Hayes, who is the real life adoptive mother of James MacArthur.
Throughout the episode, there are multiple costume changes for all the characters except Duke, who wears the same green sportcoat, yellow shirt, and red striped tie in every scene (and in several other episodes).
The file in the "unclaimed account" department is date-stamped 26 September 1975.
Aunt Clara is staying at the "Rainbow Tower", which is a part of the HIlton Hawaiian Villiage.