Continuity mistake: Near the beginning Rutger Hauer cuts off a police officer's hand with his sword, for a split second afterwards you can see the officer turning away with both hands clearly intact. The scene happens right after the young kid's mother is killed.
Continuity mistake: When MacCready desperately asks Cobb to get Bruce Lee or his brother, to help them solving the actual situation with blind man Nick Parker, it can be seen in a few shots that Cobb has his hair cut shorter, looking different, denoting that the scene was shot afterwards, once they edited the movie.