There is a spelling error in the rolling end credits. "Any unautorized duplication...". The correct spelling is "unauthorized".
At about 18 minutes in, as Vanessa and Christina are being questioned by the cop while handing out Dangerous Waters handouts, she tells the cop that he'd just have to believe her that Aquanoids exist. But, she'd just taken pictures of one.
At about 17 minutes in, as the dead surfer is being recovered from the sea, all of his leg injuries from his earlier Aquanoid attack are missing.