For Larryriche, I got an email saying you posted here with this question:
in lesson 1.5 does the tudor pronounce the word doctora as doctoda or doctor-ra
I am quite sure it is doctoRa, but the Spanish r is pronounced harder than the English with the tongue at the front/top of the mouth, and might be confused with our d sound.
Aurora: it seems to me that the transition from buenos días to buenas tardes to buenas noches is much more ambiguous than in English. As you learned, I have read that buenas tardes is not used until after one has had his or her lunch, which, I think, in most Spanish speaking countries is later than our traditional noon-time meal. And I understand that buenas noches is used either after dinner or after the sun falls. Maybe it varies in different cultures, but in any case I don't think it is as egregious an error as when someone says, "good afternoon" at 11AM or 11PM.