The house Jay Rockfelt's parents live in, is the same as the house in the episode "where's Houston?"
The home used for Keith's house [944 Ariole way, Belair] is the same location used in the Columbo episodes "Murder by the Book" and the "Most Crucial Game"
The episode title "Dwarf in a Helium Hat" refers to a record album Rick Springfield's character is supposed to have recorded.
The exterior shot of Julius' parents' house is the same house used for the show, Eight is Enough.
In the extended scene inside the Rolls-Royce, the rear seats have headrests but the front seat headrests have been removed for filming.