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.
Crowning Moment of Awesome: No, not for anything in the show. DC Comics hired Jack Kirby to redesign his characters, leading to an unprecedented deal where he finally got royalties for his characters, as well as publishing the last major Kirby comics work in the "Super Powers" comics.
Crowning Music of Awesome: Say what you want about the series: Badly animated? Maybe. Bad voice acting? Maybe. Plots that were so thin as to be anorexic? Maybe. But the theme song... man, the theme song was epic!
The opening theme of Challenge of the Superfriends ending with the Superfriends and the Legion of Doom running towards each other
Also, Medulla, because she turned Wonder Woman into her brainwashed slave. Yuri fans rejoiced.
Growing the Beard: The franchise started to do this by replacing Wendy and Marvin with the Wonder Twins and by having more serious stories (for the time period anyway). Grew the full beard with Challenge of the Superfriends.
Did it again toward the end with the additions of Firestorm, Cyborg, and Darkseid, making a rare Long Runner whose final season is widely regarded as one of its best.
Hilarious in Hindsight: Thirty years later, the utterly goofball plotnote The moon is an egg, which hatches out a hyper-gigantic space-creature of the episode "The Man in the Moon" was reused (presumably unknowingly) as the Doctor Who episode "Kill the Moon".
NONE of the Super Friends is particularly cool in hindsight, not even the ones based on agreed upon Badasses like Batman, even if they were all busy saving the world Once an Episode. It's common in parodies for the Super Friends to be portrayed as overly friendly, old-fashioned, cheesy heroes that wouldn't be able to hold a candle to the Darker and Edgier later interpretations of the Justice League and what they go up against.
As noted in his page, Aquaman gets this a lot because of his Super Friends version. Unlike the other heroes on the show though, for a long time it tainted the public's perception of him in other media as well (hence why he also gets his own mention in his own page).
The original wonder duo, the powerless kid sidekicks Wendy and Marvin (and Wonder Dog!) also get this often because of their percieved uselessness and unexplained presence (the powerless kids get to hang out with the all-powerful grown-up heroes, why exactly? The comics explain it, but not the show itself). In one comic they show up only to later get mauled (and to death, in Marvin's case — Wendy survived by being paralyzed, then became an Adaptational Badass by the codename of "Proxy") by Wonder Dog, deconstructing their pressence in a superhuman setting.
The Super Friends versions of Hawkman and Hawkgirl are often mocked for having the ability to fly... on a team with an overfilled Flying Brick quota that already has that covered and then some. In a Fairly OddParents spoof, the Hawkgirl parody had "all the powers of a hawk and a gal!" And was the the last to arrive at a fight each time because how slowly she flew in comparison to the others...and then had her butt handed to to her once she actually got there.
Memetic Mutation: "Meanwhile, at the Hall of Justice!" and the scene-switching "whooshing" sound.
Superman's Catch Phrase ("Fight for justiiiiice") was this in Latin America, due to the very hammy delivery by the late Mexican voice actor Maynardo Zavala.
"Solomon Grundy want pants too!"
Narm Charm: There's something oddly sweet with in regards to the PSA featuring the Friends. As a kid, you'd feel that they were sorta looking out for you despite not being "real".
Inverted in that the various incarnations of this series got artistically better with each one. For instance, for all the snickering about the Wonder Twins, at least they could meaningfully contribute to the fights with their superpowers, which is more than Wendy and Marvin could ever manage. Later, the producers gradually began to realize that the original DC Comics characters were usually better than anything they could create themselves and began to act accordingly such as including Firestorm, Cyborg and Jack Kirby's New Gods villains.
It can't be emphasized enough just how bad that first season was in comparison to all that followed, and not just because of Wendy, Marvin, and the inexplicably anthropomorphic Wonder Dog. The Moral Guardians were at their strictest during that year, so every antagonist the Super Friends encountered was either a Well-Intentioned Extremist that just needed a gentle reprimand, or a Harmless Villain so pathetic that any one of the five adult Super Friends (yes, even this version's Aquaman) should've been able to defeat alone quickly and easily (and yet this would be the only season where every single story was a full-length, hourlong episode!). Starting with the next season, the Super Friends faced villains who 1) were actually evil, and 2) had enough powers and weapons to pose a serious threat it would take the entire team to defeat. Even Gleek was a distinct improvement since, because he was an alien monkey, there was actually a reason why he was anthropomorphic.
So Bad, It's Good: Super cheesy! It really hasn't aged well! And yet you can't stop watching — especially due to the camp!
In the "Galactic Guardians" series, there's "The Fear". Egad, "The Fear". It's not the first animated rendition of Batman's backstory for anything. Especially when we see the flashbacks to pre-teen Bruce crying after his parents are killed off-screen, and then his first visit to Martha and Thomas Wayne's graves alongside the faithful Alfred.
"The Death of Superman" is a very powerful episode. The fact that Superman died, the other heroes seriously mourn the loss of their friend, and the entire world deals with the lack of Superman all happened in a Super Friends episode is still quite the shock to first-time watchers.