* {{Anvilicious}}: Particularly in the later seasons, nearly every episode took on a "cause" of some sort. Whether ghost surgery, advertising alcohol on TV, DrugsAreBad, or fraternity hazing, there was always some cause-of-the-week that the show tried to hammer home its message about as unsubtly as possible.
** It didn't help that Quincy (and in one episode ''Asten'') was not above delivering speeches about the subject.
* HarsherInHindsight: In "Let Me Light The Way", Quincy attempts to persuade the law-enforcement bureaucracy to support the nationwide use of rape kits to collect evidence of sexual assaults. The penny-pinching reluctance of an FBI official to fund Quincy's plans seems a lot harsher when one considers that, forty years later, thousands of the rape kits which RealLife [=ME=]s and activists like Quincy worked so hard to make available have been left sitting in the evidence room, collected but never analyzed, because it would cost money to ''test'' them.
* SeasonalRot: Quite a few people find the later seasons less enjoyable because of their tendency towards [[{{Anvilicious}} preachiness]].
* TheyWastedAPerfectlyGoodPlot: "What Happened To Morris Perlmutter?", in which a gripping murder mystery is inexplicably sidelined in favour of a PSA about the title character's hearing for almost the entire episode. (Why yes, this ''is'' [[SeasonalRot from the final season]], how'd you guess?)
** That is to say, the murder that opens the episode is quickly shoved to the sidelines. A blood test against a possible suspect turns out negative, until it's revealed the suspect is anemic and requires frequent blood transfusions, which caused the negative result... then nothing. That little discovery ends the murder story and it's not touched upon again.