 In the original script, Polly Lobster was replaced by a sultry  female parrot who flirted with Silver. When this got "too weird",  according to Brian Henson, she was replaced with a male parrot named  Stevenson (after Robert Louis Stevenson) who pointed out the changes  made from book to movie. Stevenson was replaced by Polly Lobster for  the film, but later showed up in the PC game based on the film.