A serious post... Just a comment from Italy (it may be a nice addition to an episode capsule).
In general Italian language is generally misused, even from the character who are supposed to be mother tongue (ie MIlhouse Grandma) or the voice from Lisa's course tape. I'll write out the italian parts and point out the main errors: The Italian-americans course "Voglio affittare una barca piccola": no real mistake here: just usually we would say "noleggiare" when we speak of car or boat rental "affittare" is more often used for apartments. "Progetto di scaricare questo corpo nell'oceano" "Questo e' quello che prendi per fare domande": awful pronounciation in both phrases. The second one is wrong: we don't say "prendi", a real italian phrase could be "Questo e' quello che tocca a chi fa domande" o "Ecco cosa facciamo a chi fa domande". Both phrases aren't a literal translation though.
Milhouse showing up: "La lingua di arte e la musica": this is incorrect. it should be "La lingua dell'arte e della musica". literally: "The language of the art and of the music". We almost always put articles in front of nouns. "Questi il mio chero-bino sono delle oliva". Brrr... awful pronounciation again and a completely wrong phrase: "Questi, mio cherubino, sono delle olive". This time a literal translation would have do better... As I said before we ALMOST always put the article... This time not, so "IL mio cherubino" is wrong. "Idiota!": this is easy... :) "Milhouse Mussolini Van Houten, parla l'italiano, IDIOTA!": good. Just a notice: Mussolini was a Last name, so maybe Benito Van Houten would do best. "Insegnante": to an italian speaker the gag about being a "masculine" teacher looses sense: even if it's true that we usually distinguish male and female nouns it's not the case of "insegnante" which is the same in male and female form and can be distinguished only by the article. A better choice: "Maestro" which stands for a male teacher instead of "Maestra" which is feminine.
Milhouse 2: "Buongiorno Milhouse" "Perfetto!" "Milhouse: che cosa di nuovo?": another wrong phrase, another too literal translation. It should've been: "MIlhouse, che c'e' di nuovo?" "Ciao Milhouse, come stai?" "Un gelato per la bella ragazza"
And, from my previous post: "Sono cosi' matto a lei! Ho pensato abbiamo avuto qualcosa andando, e poi la prendo con questa sgualdrina" wich sounds like: "I'm so mad at you! I thought there was something going on, and then I catch you with this bitch."
It' a sort of litteral translations. In fact we don't use forms like "I'm mad at someone" or "having something going on". We would have said "Sono furiosa" (yes, we distinguish male and female forms of nouns and adjectives) which is: "I'm furious" and "pensavo ci fosse qualcosa tra noi" (literally:" I think there was something among us". I think it was intentional, to make fun, but I don't know... The whole episode is full of bad spelled sentences. Not that my english is any better... :) I guess that's just the way an italian student may speak so it's what Lisa should say.
Well, excuse my poor english (maybe as poor as the Simpson's italian?) :)
Now I'm looking forward for the forecoming italian episode...