(A correct response for Boid Brain, because I looked it up)
A flick that was directed by the dude who directed the sequel to "Planet of the Apes" and starred ...
Alan Hale, Jr. (no 'lil buddy included)
Dennis Hopper (NOT Coopa)
Bruce Dern (NOT Middle Aged Crazy)
Mark Lenard (no ape mask OR pointed ears)
extra credit for naming the director, AND the star of the movie
(small hint ... it IS a western)