Re: I must apologize...
Shelley Duvall's earliest film appearance looks to be at 19 in Robert Altman's "Brewster McCloud", a very strange film that everyone should see at least once. Trek veterans Sally Kellerman, William Windom, Rene Auberjonois , and John Schuck also appear.
Curly: Moe, Larry, the cheese! Moe, Larry, the cheese! (Horses Collars, 1935)