Speaking of conversation typos and bugs, some I remember in SC2 off the top of my head.
1) The Syreen dialogue as a typo "Mcyon fiends" or some such thing. 2) The Pkunk dialogue when you try to war with them drops you out to space when you say you want to fight them the second time without a response from the Pkunk in any way. 3) One section in the Spathi or Pkunk dialogue puts up too many options or overwrites the other options so you see the previous questions.
I don't know if these were corrected between this and the 3DO, but some things to think about.