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.
This film provides examples of:
Big Lipped Alligator Moment: One that didn't make it to the final cut. At one point, Willow has to cross a river. A strange hairless boy asks him what he's doing, and warns Willow that the water is cursed, just before jumping in himself. Later, as Willow rows across, the boy resurfaces, but this time his teeth are long and sharp, like a carnivorous fish. He resurfaces again a moment later, and now has a fin on his back. Finally he resurfaces as a monstrous fish and attacks Willow's boat, capsizing it and pursuing Willow through the water. Willow manages to escape by throwing one of his magic acorns at it and turning it to stone (which explains why he was given three acorns, yet only seen using two). The scene was not cut for time, or because it had nothing whatsoever to do with the plot. It was cut because they could never get the fish monster to look right. As it turns out, it lifted easily out of the story because it comes out of nowhere, is never explained, and is never mentioned again.
Crazy Awesome: Madmartigan has plenty of this. Taking on armies single-handedly. Seducing the Big Bad's daughter. And last but not least - launching himself from a catapult in the general direction of a massive two headed dragon. And killing The Dragon of the Big Bad for good measure.
Willow unintentionally does this by turning a troll into a two headed monstrosity. This leads to a fight with the forces of evil, a swordsman and a two headed tumor dragon.
The whole trilogy is basically a deconstruction of The Chosen One and fantasy tropes in general; like the movie, several characters are ludicrously powerful with backstories about how super special they are to the setting but they're all really just support for a relatively weak sorcerer.
Neutral Good: The midwife, protecting the baby she didn't even know not for being The Chosen One, but because it was the morally right thing to do at the time
The opening on the movie, in which Elora Danan's mother hands the child to the midwife before Bavmorda orders the former executed. Later, the midwife is attacked by ferocious death dogs and forced to place Elora on a makeshift raft.
Then of course there's the fight with the dragon.
There's a positively scarifying scene where Bavmorda transforms Airk, Madmartigan, Sorsha, and their allies into pigs. All, that is, except Willow, who protects himself from the curse using a "shelter chant" Raziel taught him.
Of course, as some parts of the internet will show you, that scene was instead Fetish Fuel for a lot of impressionable young people.