 The fancy dress party contains several references to  Douglas Adams (qv) 40th birthday party. At the real party, Adams  introduced Darwinian Evolutionist Richard Dawkins (qv) to the  future Mrs Dawkins, actress Lalla Ward (qv). In the film, Arthur  is seen reading Dawkins book, "The Selfish Gene", when he meets  Tricia, who is dressed as Charles Darwin. Adams and Dawkins became  very good friends after Adams received a fan letter from him.