The are some important differences in vocabulary and slang. The accent, of course, is different for each country. Probably the most outstanding difference is the accent from Argentina and Uruguay (which are almost identical): they speak Spanish with a distinctly Italian accent, which is unique in Latin America.

Spain - RAE standard

Argentina - Latin American standard

Mexico - ghetto low class with lots of indio words

Colombia - somewhat prestigious accent

Mexican Spanish is american English. Spain Spanish is British English. South america Spanish talk like donkeys. Central Americans speak gibberish that you can't understand like for ex. "At dio mio"

I would say Argentina/Uruguay have the most rare accents. Spanish accent is very different than all Spanish speaking countries aswell. They speak fast but whispering way and they put less emphasis on their vowels and their "S" sounds like a "SH" and their "Z" and soft "C" is very unique. It's like prouncing and "F", but instead put your tongue in your upper teeth rather than your lower lip.. Uruguayans and Argentinians speak like Italians and pronounce their "LL" and "Y" sounds like "SH".

The rest of countries have all their differences aswell. The most notable difference in the rest of the countries is that the pronunciation of "K", hard "C", and "Qu" has more emphasis and many put more emphasis in their vowels and that's why they sound like they're yelling sometimes.

Here's a mexican comedy show. Let's if you're able to distinguish the "Argentinian" character