Cheat: During the Island Infiltration after the second sentinel, if you go through the bushes and the tiki heads you don't have to go over the bridge.
Character mistake: During the exchange level (first level) if you jump in the truck and the guards don't notice you, you'll eventually get to the gate. You'll hear the guy driving the truck say that there are 20 cases of wine. But if you count all the cases there are only 19.