In the opening scene, Burke's date is painting at a easel. She says that the picture is for the cover of a scholarly book that she is writing about the Stone Age and dinosaurs. The finished artwork at the end depicts a dinosaur attacking a human. Humans and dinosaurs never coexisted. The human Stone age ran from about four thousand to two thousand BCE. The last dinosaurs became extinct about sixty-five million years ago.
When Doris asks for Burke's phone number, he pulls out a pen. Even beat officers carry business cards with their contact information.