Because the film is based on a children's picture book, many additions were made to the storyline in order to bring it up to feature-length, including some information about the backstory of the title character and reworking the story's minor character Cindy Lou Who as a main character. Most of the rhymes that were used in the book were also used in the film, though some of the lines were to some degree changed and several new rhymes were put in. The film also borrowed some music and character elements that originated in the 1966 animated television special, such as the song "You're a Mean One, Mr. Grinch" and the Grinch's green skin tone.