This movie was made and released about six years after the disappearance and alleged death of Juanita Joan Nielsen (22 April 1937 - est. c. July 4, 1975).
After Jessica returns from the police station after being falsely arrested, there is a scene between her and Elliot where she is explaining to him what happened to her. The scene takes place on the shore of Sydney Harbour and there is a ship being painted in the background. The scene is only two or three minutes long but the significant progress made by the painters on the ship is clearly visible and betrays the actual length it took to film the scene.