Continuity mistake: When Christmas sets up the guns on the front of the plane he turns to Barney raising his right hand. As he turns back in the close up he starts to lower his left hand, this is a continuous scene.
Continuity mistake: Throughout the car chase between Barney and Gunner, the damage to Barneys truck keeps changing instantly.
Continuity mistake: When Barney stops at the traffic lights just before the car chase with Gunner, the car behind them slows down and stops. When the camera changes angle the same car is seen from a distance slowing down and stopping again.
Continuity mistake: When Barney is driving his truck away from Gunner his windscreen gets shot to hell. In one shot however all the bullet holes disappear.
Other mistake: When Christmas starts the plane up when leaving the island the first time, he doesn't cut or loosen any of the mooring lines. However he takes off without a problem.
Other mistake: In the opening scene on the freighter, the laser beams track the hand movements of the pirate. First, it is much faster and more precise than what would be possible. Second, why would the SWAT team aim at the pirate's fist, just because he was acting tough?
Continuity mistake: When Stallone is hanging in the door of the seaplane, in the closeups there is water spray all around him, but in the wide shots of the plane, the water spray does not reach the door.
Character mistake: Tool neglects to dress Barney's tattoo after he completes it. Not something a professional tattoo artist would neglect to do, especially when he is tattooing a friend.
Suggested correction: Tool states that it's taken him several months to do the logo tattoo. It's also implied that he has done the rest of Barney's tattoo's. Barney, being the tough man he is, could have simply said in the past not to bother with dressing it and Tool has done as told against his better judgement.
