Audio problem: When Judge Dread and Rob Schneider are running to escape from oncoming guards they are stopped by one guard right before they leave on the motorcycle. The guard says "I knew it was you Dredd." The camera focuses on him before he is done saying that but his mouth is not moving.
Audio problem: Just before Junior Angel shoot a missile on the prisoner's ship, he says something like "Gonna get me some city boys", but his lips don't move.
Audio problem: As he's walking through headquarters to get Rico, Dredd is unmasked by another judge. You hear the the guy say "I though it was you!" but his mouth doesn't move.
Answer: The facility only ever cloned Rico and Dredd. It had never been tested at max capacity. The equipment was also 30 years old and Rico tried to birth the clones early which the system wasn't designed for. The stress of all these things added up to destroy it.
Grumpy Scot