Continuity mistake: In the scene where Alex is massaging Corwin, as she runs to jump on his back, she is running alongside him and then she jumps. It then cuts to her just jumping on his back.
Continuity mistake: When they are driving in the Ferrari 360, if you look at the lanes, they are driving on the correct and oncoming lanes.
Continuity mistake: In the last scene with the tugboat you can see the wake starting a few hundred meters behind the boat, even though it is supposed to have been sailing for a while.
Continuity mistake: In the car chase scene, when the red Ford Taurus flies into the air and flips, in one shot its a 96-97 model, in another shot it becomes a 98-99 model (grille is different).
Suggested correction: Knox wasn't a trained pilot. Either he had no clue to what was going on, or he thought something may have been wrong, but didn't know what to do about it.
Taking off and landing a helicopter are by far the most intense and difficult part of a pilot's training. Seriously, 99% of learning to fly is learning how to land and take off. If the pilot is skilled enough to take off in a Huey he is easily skilled enough to notice a massive additional drag on his helicopter due to the additional weight of the angels and the air resistance put up by such a bulky protrusion on his aircraft. If he isn't skilled enough to notice that, he isn't skilled enough to take off in the first place.