Character mistake: When Morpheus is explaining to Neo the reason the Matrix exists, he states that a human being gives off 25,000 BTUs of body heat to help power it - this is just not true. Even human beings that are running a marathon can't give off that much heat, and the humans in the Matrix are all lying down, not moving.

The Matrix (1999)
1 character mistake
Directed by: Lana Wachowski, Lilly Wachowski
Starring: Keanu Reeves, Laurence Fishburne, Hugo Weaving, Joe Pantoliano, Carrie-Anne Moss, Gloria Foster

Visible crew/equipment: When Neo is going to open the door to enter the Oracle's house, you can clearly see a camera on the doorknob. There's a sheet over it painted to look like the wall behind it, with a representation of Morpheus' tie too, because he's blocked by the camera. (01:07:40)
Agent Smith: I'd like to share a revelation that I've had during my time here. It came to me when I tried to classify your species, and I realised that you're not actually mammals. Every mammal on this planet instinctively develops a natural equilibrium with the surrounding environment; but you humans do not. You move to an area and you multiply, and multiply, until every natural resource is consumed and the only way you can survive is to spread to another area. There is another organism on this planet that follows the same pattern. Do you know what it is? A virus. Human beings are a disease, a cancer on this planet, you are a plague, and we...are the cure. (01:02:20)
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Answer: He doesn't know that he's plugged into a giant computer and that most of humanity is a power source for robots. He's merely aware that there is something wrong with life in general, something odd that he can't quite explain.
Gary O'Reilly