[Ainaserkewen]

My dad pointed this out when he saw the movie:

(It would be weird book-wise too) Frodo and Sam were mere meters away from the boiling lava on Mount Doom. My Dad says they shouldn't have been able to survive. That, and Gollum would have vapourised when he hit the pools of lava, not slowly burned to death. But all this would have seriously rearranged the story, so I guess it's okay.