These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Wonder Years
Creator's Pet: Winnie is/was this to some people because of the way she treated Kevin.
Seth Green plays a student in "Lunch Stories" and "Sex and Economics".
Subverted with Marilyn Manson. Despite the urban legend that he played Paul, the role actually belonged to Josh Saviano.
Tear Jerker: Built on a metric ton of these. Special stand-outs include the first episode's final revelation, Kevin's "I love you" to Winnie while she's sick at home, Kevin failing his piano recital utterly and admitting (in narration) that he doesn't even remember how to play anymore, and the Series Finale's ending commentary.
The entire Series Finale has to be one of the saddest, yet most enlightening in TV history.
Can't forget the time a teacher he was starting to bond with passed away.