John le Carré in Tinker, Tailor, Soldier, Spy
He plays a guest at the MI6 Christmas party. The author can be found standing next to a spy dressed like Lenin.
William Peter Blatty in The Exorcist
Early in the movie, before the pea soup really hits the fan, Reagan’s actress mother is working on a movie. Blatty plays the producer of the film in a short on-set scene, asking if one of the scenes is really necessary. It’s a case of art imitating life, because Blatty had many similar disputes with The Exorcist director William Friedkin.
Kathryn Stockett in The Help
The author of The Help has a bouffanted cameo as part of a scene involving the Junior League. Her mother, sister, and some friends also appear.