Why should we listen to the Houyhnhnm? They're horses, who gives a crap?
Gulliver's misfortunes are intentional and he prefers being In Harm's Way. He secretly loves his arduous trips, hence why he spends very little time at home before he leaves for sea, intending to be shipwrecked again. Or maybe he just hates the missus.
The surreal events of the book combined with Gulliver's increasing misanthropy raises many questions about his mental health and how reliable he is as a narrator. There has been some speculation regarding how much of the story actually happened and how much is just in his head.
Whether the Houyhnhnms are meant to satire the Enlightenment of the 18th-century or they really are Swift's idea of the perfect society has been debated by scholars for years. Given the theme of the rest of the book, it's most likely the first one.
Anvilicious: Swift isn't shy about hiding his contempt for the English society of his day, or for human beings in general. However, what kind of society he advocates as a better alternative (or even whether he thinks a better alternative is possible) remains hotly contested.
Part two describes Brobdingnag as being located in a part of the world which was not known to Europe at the time. Now we call it Alaska. Aside from the size; Brobdingnag is stated to be about twice the size of Africa.
The invention that randomly combines words so that "the most ignorant person, at a reasonable charge, and with a little bodily labour, might write books in philosophy, poetry, politics, laws, mathematics, and theology, without the least assistance from genius or study". Today, we call this Wikipedia. Or perhaps SCIgen would be a more literal analogue.
A situation where a man walking on the road is so immersed in other matters, that he constantly needs to be slapped so that he won't be ran over. Has no time for his wife, but who cares? So long as he can distract himself, he won't notice his wife cheating on him right before his eyes. The modern term is "smartphones".
Values Dissonance: In the second part, Gulliver describes how he saw an execution by beheading. His eight year old "nanny" was brought along. Back then, having children watch justice being served even in much gorier ways than simple beheading was no more controversial than an anti-drug video shown in school today.
Cult Classic: For all of its faults, the film was popular in its heyday and still an enjoyable cartoon romp today, and it's remembered fondly enough to be considered a legitimate classic. It helps that the film is one of the very few animated features to be in the Public Domain, thus making it an easily accessible staple of classic animation.
Dork Age: This film is considered the beginning of the end for the Fleischer Studios.
Ear Worm: "All's Well", "It's A Hap-Hap-Happy Day", and "Bluebirds in the Moonlight".
Nightmare Fuel: The shot where Gabby stumbles across Gullivers enormous hand, and where he runs away and sees the giant form in the distance.
Romantic Plot Tumor: A damn good portion of the movie is spent emphasizing on David and Glory's love for one another and their wedding, and they barely even get any real screentime or non-singing dialogue! Their wedding is LITERALLY only in the beginning to start up the conflict, but the thing is Glory and David have no personality beyond loving each other and don't get to really talk till the very end of the movie, so the whole wedding plot comes off as this super contrived just to shoehorn in a reason for war.