Changes to the original include the romance between Gladys and David and “some censorship restrictions that kept Dorian's unspeakable acts offscreen.”  In the book, the picture alters in response to Dorian's "good deed", but the alteration is ugly, reflecting his cynicism and self-serving motivation. He stabs the painting to destroy his conscience and eliminate the evidence.
Changes to the original include a romantic relationship between Gladys and David and “some editing rules that prevented Dorian's unacceptable behavior from being depicted.”  In the book, the image changes in response to Dorian's "good deed", but the alteration is ugly, reflecting his cynicism and self-serving motivation. He destroys the painting to conceal his conscience.