According to the book All About Pinball, 'Pleasure Isle' and its replay version Gottlieb's 1965 'Paradise' were the first playfields designed to have flipper return lanes, which are wireforms that allow the ball to roll behind the slingshot and towards a waiting flipper. However, Gottlieb rescheduled the production of a subsequent game designed with return lanes, Gottlieb's 1965 'Bank-A-Ball', so that it could be produced first.