RP, I don't believe scientists are confused about continental shift and Mesozoic period climate. https://www.khanacademy.org/partner-content/amnh/dinosaurs/studying-dinosaurs/a/where-in-the-world-did-. And besides, dinosaurs were not necessarily cold blooded. http://www.nature.com/news/dinosaurs-neither-warm-blooded-nor-cold-blooded-1.15399.
Plus, earths magnetic field, which acts as a shield, has been shifting for quite awhile. http://image.gsfc.nasa.gov/poetry/tour/AAmag.html. So only the magnetic poles move, not the earths axial poles. No climate impact.