The William Butler Yeats poem is misquoted on the door in Dr. Hobby's office. Dr. Know reads it "Come away, O human child! To the waters and the wild..." This is the correct line, and also what Gigolo Joe says as he reads it. However, the lines on the door read "To the waters of the wild".
When the robots open the frozen door to the Amphib Craft, David's trousers are already wet on the left leg from the knee down. But when he gets out, they are dry and twice he slips on the ice and both times he lands on his left knee.
When Dr. Hobby removes the CPU from mecha Sheila's forehead, the module is about as big as a walnut. But when he holds the module up to show to his colleagues, it is a cube about the size of a billiard ball.
Monica takes David to the forest to abandon him. While she is telling him her plan, the sun is shining brightly on David's head and hair when the camera angle is showing Monica's face. However, whenever David's face is shown, his head is in shadow.
Much of the film's early action takes place in Haddonfield, New Jersey. New York City is subsequently shown to be under water. Haddonfield's elevation (81 feet) is lower than that of New York City (87 feet), and it is near both the Atlantic coast and a river leading to the ocean, so Haddonfield should be under water too.
When the robots are in the cage at the Flesh Fair, the little girl tells her dad about the boy in the cage. On a screen above his head, we see a replay of the "spider" type robot with the human-like head destroyed. He is then taken moments later when David grabs Joe's arm. He is then destroyed in the same manner as the so-called replay.