Both Roger Perry and John Gilgreen had appeared in 6 other Barnaby Jones episodes and Alex Henteloff had appeared in 5 other episodes over the years.
It would have seemed prudent for J.R. to have removed personal documents from the vehicle and locked the doors while working undercover!
This is one of the few times that John Carter was in the opening credits.
In an episode in the first season Andrew Parks played a prep school student and in this season he played a law school student. Both times his character came from a wealthy background.
Annette O'Toole appeared in the first episode of SWAT which Mark Shera also starred in. She is currently playing the mother of Clark Kent on Smallville.
In this first episode it was stated that J.R. had finished law school in Chicago and was studying for the Chicago Bar. He was suppose to work part time for Barnaby while he studied for the California Bar instead. However in the episodes that followed, J.R. was back in law school, a fact that was never explained.
Jerry Houser played a student once again (this time a college student) in the 5th season episode "Killer on Campus". As in this episode a stronger minded student leads him astray and into trouble.