I'm replaying Grim Fandango again (English version, of course :D), and I've noticed that lip sync in year 3 is a bit worse than other year's. It doesn't happen all the time, but if you pay a little attention, you (or at least I :D) can see that, sometimes, Manny moves the mouth a bit after he has finished the phrase or things like that.
It's a bit strange, because lip sync is perfect in the rest of the game. Did you notice this too? or maybe it's something that only happens to me? (it would be strange, because, as I said, other years don't have this problem).

Year 3 lip sync for me was pretty darn good. The only time in the entire game its a bit wafty I think is when you first meet Glottis.

Funny. I don't remember anything strange in that scene with Glottis. Maybe my "problem" with Year 3 has something to do with the subtitles? I changed their speed a few times during the game, maybe something got "stuck". But I tried to disable subtitles and changing their speed again and didn't do anything...