* AdultFear: Let's see. There's the confrontation with that grave digger, the time the main trio got locked in that condemned barn, the incident with the new kid falling in with a local thief and nearly dragging Joe along for the ride, the incidents involving David in the mystery books mentioned below under NightmareFuel...Wow; even in the 90s, [[WhatDoYouMeanItsForKids PBS was kinda scary]].
* EarWorm: [[http://www.youtube.com/watch?v=_qAvnY0pQNU The intro theme]].
* GeniusBonus: The contrast between military captain Miles Standish and his intellectual best friend John Alden is a big point in ''The Courtship of Miles Standish''. The episode doesn't really go into that but their counterparts are the modern teenage equivalents: Joe the basketball star and David the science whiz.
* NightmareFuel : The Morlocks in ''TheTimeMachine'' episode.
** They did a version of ''{{Faust}}''.
*** Or their version of ''Literature/ThePhantomOfTheOpera'', or ''Literature/TheLegendOfSleepyHollow'', or ''Literature/{{Frankenstein}}'', or Crazy Joe in ''TomSawyer'', or...
** The mystery chapter books do it too. One features David disappearing without a trace for at least a day and another features the story's villain trying to run him over for trying to clear his own name. [[DesignatedVictim Why is it always David?]]
* PeripheryDemographic: A lot of teenagers and adults enjoyed the show and still do.
* {{Squick}}: Many episodes, such as ''ATaleOfTwoCities'' and ''PrideAndPrejudice'' featured the titular canine playing a heroic lead together with a human, female love interest. This lead to many, many scenes of attractive young actresses behaving in a romantic and cuddly manner to [[FamilyGuy a freakin' dog]]!
* TearJerker:
** Frankenstein (given that they follow the theme of the book, it's pretty hard not to be one).
** The scene in Dances with Dogs as Joe remembers his father pushing him on the tire swing is a bit heart wrenching.
** The end of the ''Tale Of Two Cities'' episode. They keep the "it is a far, far better thing that I do, than I have ever done" line and the guy playing Sydney Carton is actually a pretty good actor. Just try not to think too hard about how he expects no one to notice that a dog has been replaced by a human man.
** Joan of Arc saying goodbye to her friend before her execution.