premise: Anne of Green Gables is a 1934 film directed by George Nicholls, Jr., based upon the novel, "Anne of Green Gables" by Lucy Maud Montgomery. The actress Dawn O'Day who portrayed the title character of Anne Shirley changed her stage name to "Anne Shirley" after making this film. There was also a sequel; "Anne of Windy Poplars".
hypothesis: Anne of Green Gables is based upon a novel by George Nicholls, Jr.,
reason: It is based upon a novel by  Lucy Maud Montgomery but directed by George Nicholls. Both names were in the passage close together so that confused the system.