Revealing mistake: When Jude Law needs to pull himself up the flight of stairs to reach the intercom, you can see him use his hips, despite the fact that he is paralyzed from the waist down.
Revealing mistake: In the scene where Anton and Vincent are swimming in the ocean, the state of the sea when near the beach doesn't fit with how it is when they're further offshore.
Answer: The leg bones are fractured completely across, at a location between the rings of the device. Thereafter, while the bones are knitting back together, the device is periodically adjusted to drag the bones away from each other a fraction of an inch. The bones continue to grow toward each other to close the gap, gradually lengthening. It is an astoundingly painful way to add height.
Rooster of Doom