Character mistake: When Sean and Hank are trying to get to the Nautilus, they swim right through a big school of jellyfish. Seems really unlikely that Sean, raised by a scientist and Hank, an ex Navy man would do this, considering how many species of jellyfish can give a sting ranging from agonizing to deadly. And, while they have a limited oxygen supply in this scene, and time is a factor, the scene shows there is room to swim under them. They actually pause in the middle of the school to grin at each other. There would have been sufficient time and oxygen to avoid the school.
Journey 2: The Mysterious Island (2012)
1 character mistake
Directed by: Brad Peyton
Starring: Michael Caine, Dwayne Johnson, Vanessa Hudgens, Josh Hutcherson
More mistakes in Journey 2: The Mysterious Island
Plot hole: As the island is sinking you can see parts break off, like the island is falling apart, but if it does this every 70 years then there wouldn't be an island. It should have completely fallen apart hundreds of years ago.
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More questions & answers from Journey 2: The Mysterious Island
Question: If the island sinks underwater at regular intervals, then what happens to the tiny elephants, giant bees, etc (and the whole ecosystem) while the island is underwater?
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Answer: There is a deleted scene on the DVD/Bluray where they attempt to give an explanation. Kailani asks "What happens to the animals when the island sinks? They can't all die!". Alexander replies "Even the mammals develop quasi-amphibian characteristics. They just burrow below the ground's surface and absorb the oxygen through their skin."