Factual error: Gollum's body wouldn't sink into the lava if he fell in it as shown in the movie. Rather his body would burst into flames, and turn to ash. Falling in lava isn't like falling into a lake. Lava is more than three times denser than water, which prevents a human shaped body from sinking in.
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Suggested correction: This movie is set in an entirely fictional universe, which is not supposed to fully reflect realism.
