This game has the most confusing voice acting credits I've ever seen.
I analyzed the voice filenames, and found some which are never mentioned in the game. I sorted them so far:
- Frank, Fred and Fin are the Men of Low Moral Fiber, credited as Franklin, Freddy and Phineas in MI1SE.
- Larry, Crutch and Windy are the spitting contest audience.
- Greg is the fellow working with Rich.
- Skeleton and Moose are the party guests at the window.
- Fairy is one of the party guests to the left. The other one uses filenames with ZUL.
- Potman is one of the party guests at the table. The other one uses filenames with DUD.
- Clown is one of the party guests to the right. The other one uses filenames with PIG.
- Grillcook is the cook in Elaine's mansion.
- Sentry is Augustus DeWaat.
- Dealer is the roulette dealer.
Actually, the roulette dealer is names Fred, too. But due to a script bug, this is never revealed.
And I have no clue what ZUL and DUD might stand for. I guess, those, the pig and Guybrush's dad are the "additional voices" then.