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.
Karma Houdini: Becky Slater never gets in trouble for any of the mean things she does to Kevin after their break-up. Among the things she had done to him include knocking him out, telling most of the school the mean things Kevin said about them behind their backs when they were a couple, trying to run over Kevin with her bike, pouring Kevin's milk on his lap, and punching Kevin after he beats her in a race on the track field (keep in mind a teacher was there when that happened, and she got no apparent punishment).
The cool students in charge of the yearbook in "Yearbook". They let Kevin pick funny quotes for each student, including "oink oink" for a fat student. Feeling guilty, Kevin tries to talk them into removing that quote. When Kevin points out that the principal will see it, they decide to go to fix things.... By telling him that Kevin tried to sneak that quote in, and after Kevin gets detention for it, they decide they don't need him for the yearbook anymore, and remain unpunished.
Kevin, apparently, in "Back to the Lake". When driving himself and Paul to work, he decides to skip work and go to the lake to see Cara, against Paul's will. While we never see what happens when they return to work, Kevin continues to be employed at Mr. Chong's Chinese restaurant while Paul is never seen or mentioned to be working there again.
Also, in "Ladies and Gentlemen... The Rolling Stones", Kevin gets grounded. When the parents go out for the night, Jack tells Kevin not to drive his car, so Kevin drives Jack's car. He ends up wrecking the back of the car, and fears his parents finding out when they get back... only for the person who had driven them to accidentally bump into the car before Jack could see that it was already wrecked... and then Kevin learns Norma had already wrecked it.
Hilarious in Hindsight: In the episode "Heart of Darkness", Paul says that he's allergic to contact lenses, but in the last two seasons he switches to contacts.
Not to mention that in the episode before he starts wearing contacts, when Winnie informs Kevin that there's something he doesn't yet know about Paul, one of Kevin's guesses is that he's wearing contacts.
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.
They Wasted a Perfectly Good Plot: While it would have been hard to really focus on it since the shows entire focus was on Kevin and the last episode ended during the summer, it's a shame that they couldn't have shown Chuck and Jeff's summer road trip in the last episode, or even have the narrator reveal anything that happened to them on that trip.