According to director John Stockwell on the DVD commentary, a lot of the violent scenes were edited or digitally altered to secure the desired PG-13 rating.
When Jared and Bryce are fighting after they learn Sam has been kidnapped you can see Jared's mic chord under his shirt, all the way up from his waist to his neck.
At the end of the movie, when they are attempting to bring up the cannon, as the cannon comes out of the water, both the rope and the cannon are completely dry.
While being chased after having the accident, Jared jumps out of the driver's side of the truck and runs to the passenger side. There's a Land Rover in the background which disappears in the next shot.
Bryce: The guy who owned this place got hit with 44 counts of racketeering and money laundering. Our firm represented him. This is how he floated the bill.