Character mistake: When John and Judy are running from the Robots he shouts "Run Penny!" even though Penny is not there. (00:34:21)
Character mistake: One character says a concentration of 0.09 parts per million in the water is bad: "if it were salt it'd taste like you were drowning in the ocean." Rubbish. The concentration of salt in seawater is about 35,000 parts per million.