Scary Movie 2 copies the ghost sex scene. In both movies a blonde is sexually attacked by an invisible ghost in her room, but then starts to enjoy it. Afterwards she is shown lying on the bed smoking a cigarette while the invisible ghost's cigarette is seen floating beside to her. In both films the woman gets upset when the ghost leaves her.
The scene in which one of the scientists hears the theme music from 'Jaws' coming from somewhere only to find Kenny Everett playing the theme on a cello or double bass.