Numerous jokes in this episode were later reused in the three Naked Gun films: The exchange: "Cigarette? "Yes, I know." was reused in Naked Gun 33 1/3. The "Little Italy" joke was reused in The Naked Gun. The gag where Frank screams when a wig is thrown on his face was reused in Naked Gun 2/12 (except there, it was a hot towel). And the short-range shootout gag was also reused in Naked Gun 2 1/2.
Only episode where Frank would notice the child Ted is giving 'lessons' to in the Crime Lab (and smile approvingly) - in all subsequent episodes, he would act totally oblivious to the fact Ted had been giving highly questionable lessons to a child and would hardly bat an eyelid to the fact they were there.
Many characters are named after friends and neighbors of the writing/directing team. For instance, dentist Robert Zubastsky is named after Bob Zubatsky who used to live next to the Zucker brothers in Milwaukee.
In Slavic languages the name Zubatsky loosely translates as "Toothman" which is another in-joke.
A young David Schwimmer appears briefly as an extra in the waiting room.