When the Detectives are telling the Captain about the plane crash they say a forest ranger saw the crash and that the bomb was set to destroy the plane's controls. Yet the scene of the actual explosion before the credits show the plane being obliterated in mid-air. This was not a scene of a targeted explosion and the ranger would have seen and heard the explosion if he saw the wreckage hit. Plus gunpowder in a shotgun shell would NOT have caused such a massive explosion unless it was set off next to the fuel tank.