He was indeed "curiously" uncredited in
The Natural (1984). During the filming of
the movie,
Robert Redford was so pleased with McGavin's portrayal of his
character that they began to expand the role. However, after a certain
point, union rules dictated that the actor's contract needed to be
renegotiated for salary and billing. After haggling on salary, and
holding up production of the movie because of it, the billing had to be
decided. Apparently, McGavin became somewhat fed up with the
proceedings and instructed his agent to waive his billing entirely so
they could get back to filming.