The titles for these monarchs are different too, but I want to highlight the three associated with Prompto, Ignis, and Gladiolus in particular. In Spanish the connections make perfect sense, but in English they really don't (What's clever about Prompto? When does Iggy ever wander? Gladi is tall tho I'll give you that)

Juegos de Palabra

In English, some quests rhyme while most have generic titles. In Spanish the opposite is true - every sidequest rhymes with few exceptions. Spanish added a great pun to diners too: you can order "Batidas de caza" from them which means "Hunting raids." It's pronounced the same as "Batidas de casa" meaning "Homemade shakes." The fact that chefs tell you to hunt monsters makes no sense in other languages.

Here's some more text changes that I think are improvements, funny, or otherwise cute:

Also, it's adorable how the Pop camera filter is named the Prompto filter in Spanish and the Random setting is called "as much as Prompto wants" (al gusto de Prompto).

Also also, I like the Spanish description of Cid's hammer more:

Errores

In Latin Spanish, the node that increases attack incorrectly says it increases health. Spanish Spanish doesn't have that mistake.

A more substantial error is the description for the healing nodes: both Spanish versions describe Gladiolus's nodes differently than Ignis's and Prompto's. That is, they say that Gladi will heal himself automatically when he's at low health, but Iggy and Prompto will heal only when they trigger an assist skill or when Noct commands them to attack. In English, all recovery nodes have the same description and they all say that the healing is automatic. I don't know which of these are correct but they can't all be.

But by far the most interesting mistake is the names these languages give to the Aztec bosses:

As you can see, Spain-ish abbreviated the names. But Nahuatl is a language like German in that its big words are composed of smaller words. So by chopping them in half, Spain changed their meanings entirely.

Here are all the relevant words:

So Quetzalcoatl means "Serpent of Beautiful Feathers" and Mictlantecihuatl means "Mistress of Hell." But in Spain those gods aren't the bosses you face. No, instead you fight against a pile of pretty feathers and some random woman LMAO

And if you're curious why the goddess of Hell has different valid names, that's because there are different dialects of Nahuatl and variations of spelling. El Gran Diccionario Náhuatl.

Español vs. Españaol

Besides Spain being wrong about Mexico, it also has different descriptions for all the lore. I skimmed it ngl so the only difference that stood out to me is that the havens from the endgame dungeons were made dry. They don't have unique names or poetic rhyming though they do in both Latin Spanish and English. Also for some reason, Spain calls the Bestiary the Database.

Spain is also weirdly specific for the outfits without jackets. English and normal Spanish simply label them all as (No Jacket) or (desabrigado) but Spain will specify (sin levita), (sin guerrera), (en camiseta), (sin casaca), (sin chaqueta), etc.

Otras Cosas

• The highest rank you can get after a fight in Spanish is ⭐. In English it's A+ and in Japanese it's S
• The main menu is in ALL CAPS IN ENGLISH but not in either Spanish
• In English, the text above each character's experience is "To Next Level: " and in Latin Spanish it's "Siguiente nivel" without a colon and in Spain it's "Nivel ⬆"
• Bandersnatch and Jabberwock are Zamarrojo and Galimatazo in Spanish. What are the hispanic names referencing? Beats me.

The date formats used in the Ω-files are wildly different:

Finally, the line Noctis says to his bros in the last camping cutscene is more or less the same between these languages.