The girl in the music video, the vision in the red dress, wearing the high-heeled shoes, is Cynthia Rhodes. She went on after this, and because of this, to star in Dirty Dancing, about four years later, in a supporting role. With Patrick Swayze, who can also be seen in here, as the gang member, the gum-chewing one who took off his red jacket.
A myth dispelled. It's long been a popular misconception that the titular Rosanna refers to Rosanna Arquette. But the truth is, no. David Paich wrote the lyrics, and 'Rosanna' was simply the composite name for a multitude of girls in his mind. True, this might have been inspired by the fact that Steve Porcaro, the keyboardist, did date the actress, but the official revelation is that the whole legend surrounding the song has its roots in what started as a joke. Which, in any case, added allure, and obviously boosted sales.