Tavare, Litefoot, and Willie are billed 5th through 7th on IMDB.com, while Farmer is billed 12th. But I must say I didn't remember the Indians in Adaptation. Apparently they didn't make much of an impression.
Like Being John Malkovich and Eternal Sunshine of the Spotless Mind, Adaptation is strange--unlike anything else in Hollywood--and brilliant. Not necessarily great, mind you, but brilliant. When I saw this movie, I thought it had to win the Oscar for Best Writing, Adapted Screenplay. (Alas, it was nominated but lost to The Pianist.)
Many critics have said the big blockbuster ending hurts Adaptation. I agree. I was going to give Adaptation a very high rating but the ending lowered it. Still, it's well worth seeing.
My ratings for the Charlie Kaufman movies I've seen:
Being John Malkovich--7.0
Eternal Sunshine of the Spotless Mind--8.0
For more on Adaptation, see the Wikipedia entry and Roger Ebert's review. For more on the subject in general, see The Best Indian Movies.