Crowning Moment of Heartwarming: Mr. Tinkerton's reunion with Frosty in Legend of Frosty the Snowman after years of thinking he had made the snowman up. And all made possible by his younger son, who frequently felt pushed aside for his "perfect" older brother and ignored in the wake of his father's mayorally duties.
Ear Worm: Frosty Returns may be flawed, but "Let There Be Snow" is somewhat catchy. Bonus points for actually being sung by John Goodman.
"Funny Aneurysm" Moment: "Stay in here much longer, and I'll really make a splash in the world." Funny when Frosty said it upon entering the greenhouse, not so much not two minutes later; perhaps even a record-setter as far as these go.
Idiot Plot: Most of the people in "Frosty Returns" are complete idiots. Mr. Twitchell for thinking the title of King of the Winter Carnival gives him actual control over the people, the citizens of Beansboro for using the Summer Wheeze on the on the sidewalk, roads, and grass (there's nothing wrong with the first two, but using it on the grass is wasteful and pointless), and the kids for thinking if there was no more snow they'd get a 10-month summer break (which if you included weekends would be only about 60 days of school though most schools tend to go for around 180)
Informed Wrongness: From "Frosty Returns": because it's a spray that destroys snow in a kid's movie about a sentient snowman, we're supposed to be horrified by Summer Wheeze and see it getting discontinued at the end as a victory. While the villain's plan to use it to get rid of ALL the snow was indeed stupid, if it had been used responsibly simply to clear the snow from the streets and side walks, then the product would actually have been a great boon to society. Seriously, can you imagine all the time and effort that would be spared each winter if you could just spray away the snow in a matter of minutes as opposed to hours of tedious shoveling? Aging people (like that teacher in the movie) can even die of heart attacks if they exert to much effort shoveling. So the only evil was in how the product was used, not in the product itself.
Moment of Awesome: So after Santa rebuilt Frosty and was about to put the hat on, Hinkle comes to grab it again. How does Santa put an end to it? By threatening to never give him any more presents for the rest of his life. It instantly shuts him up.
Possibly even earlier when he douses Karen's campfire, which was the only thing between her and freezing to death. It's especially bad because he does so for no good reason. At least killing Frosty helped him achieve his goal of getting the hat back, but endangering the little girl achieves nothing.
The worst part about Hinkle is, he wants the hat back solely because of greed, claiming he'd be "a billionaire magician" if he had it. That's kind of low.
Narm: Paul Frees' voices for some of the kids in the original version. While June Foray's voice for Karen fits her just fine, the blatant Vocal Dissonance in the boys makes it easy to see why it was redubbed.
In the Legend of Frosty the Snowman, when Plankley get's Walter to convince Frosty into skating on thin ice, and the ice breaks, melting Frosty when he falls in the water. It's unnerving because Plankley had basically made Walter an accessory to murder. Walter's pretty heartbroken about what happened to Frosty, as he had no idea what Plankley really wanted.
In Winter Wonderland, when the cop swallows his whistle again, this time he appears to be legitimately choking on it, compared to the first special, where he was just comedically whistling as a result of swallowing.
Retroactive Recognition: In Frosty Returns, it's a case of Retroactive Name Recognition, since if you didn't see the credits you wouldn't have any idea that Holly was voiced by a 10-year-old Elisabeth Moss.
Part of the reason the Green Aesop fails is that it the ecological implications of a world without winter are only briefly touched on. For the most part, the message is that we need to have snow because snow is fun and pretty.
Sweet Dreams Fuel: The first one in particular, but all of the other specials are this to an extent. They seem tailor made to give that warm and fuzzy feeling.
Tear Jerker: When Frosty is melted, and again when Frosty and Karen have to part in the penultimate scene.
In Legend of Frosty the Snowman, the little comic Tommy finds quickly takes a turn for the sad when, after having tons of fun with Frosty, the boy is told by his magician father (who appears to be Hinkle) that real magic, "the kind you can't explain", doesn't exist and when he tries to find Frosty after that, the snowman has disappeared entirely. As Tommy reads on, he discovers Frosty disappeared because another boy was jealous of Frosty's kindness to the main character and stole Frosty's hat and locked it in a trunk. Then Tommy realizes, to his horror, that the boys are actually his father and the assistant mayor, the latter of whom is constantly pressuring Mr. Tinkerton to sap fun and life out of the town with rules. He's noticeably shaken by this revelation.