Continuity mistake: When Plato and Sam are driving the van (right before they pass the elderly woman) you can clearly see they are driving through palm-tree Miami. But when it switches to the internal view, the greenscreen scenery shows mountainous pine forests.
Continuity mistake: In the swampboat chase scene, pay attention to the scenery right before Plato, Sam, and his daughter run into dry land. You'll notice that in one scene they are in the middle of the marshes, no land or large trees around, and in the next scene they are running aground on solid ground, surrounded by trees at least 20 feet tall.