Uuuuusually what they do, since this is the Latin American dub, they keep the Spain-Spanish accent. But if the joke is that nobody understands Buzz (spoilers!)... I've heard other dubs where they use Italian. Or French. It's so weird. o_O I have no idea what they do for the Spain dub tho, since they're very against non dubbed movies as far as I know, and they translate everything (for example, there's a magazine called "Interview", but they write it phonetically as "Interviú")