They used people who didn't fit the stereotype, like the ones that say "sho" instead of yo/sound Italian sing-song like, weren't used here.
Also, the Dominican girl pronounced more letters than some of the ones I've come across
With Colombian men it's easier for me to spot them than the Colombianas.
This. She pronounced letters why too formally. That was not colloquial Dominican spanish at all.
The Argentine dude didn't sound like he was from Buenos Aires. People from Buenos Aires have an accent that's way easier to spot.
In general I'd say the Spain, Mexican, Colombian, Chilean, Caribbean and Argentina accents are the easiest to spot. The rest just blurs into each other if the language is spoken neutrally
Also within countries there's tons of accents too.
I played the Argentine man's video twice and if you notice at the very end of his sentence he takes on something that has a very porteņo sound to it and that's what gave it away for me.
The Chilean one was easy too. I was like "she pronounces her single Rs in a real different way."
Anyways I got a 12/20 which is good since I'm a non-native speaker. My Bachelor's in Spanish coming through.