When Charlie is in freefall chasing Nastassja after she 'falls' from the plane, when he opens his chute, it's shown from above as solid orange. A few moments later, when shown from below it's orange with purple end cells on one end and a black center cell. Moments later, it's shown again from above as solid orange.
The girl throws pebbles at the electric fence surrounding the facility they break into in the desert, the electrified fence sparks. Pebbles thrown at a single layer electrified fence would not cause a reaction.
In the several scenes where reserve parachutes are used, once they are inflated, a pilot chute can be seen trailing behind and attached to the top skin. Real reserve parachutes do not have the pilot chutes attached to them, the pilot chutes and deployment bags are designed to automatically disconnect after the parachutes inflates.
The 747 in the airplane graveyard would not have any functioning electrical systems, including the pre-flight video that was triggered during the shoot-out. All systems are deactivated and electrical power removed when aircraft are mothballed. The plane wasn't "mothballed", it was landed there to hide it. They intended to fly it within a few days.
The goof item below may give away important plot points.
When in the final fight Ditch releases Pinkwater's reserve, Pinkwater is drawn by it into the rotor of the windmill. The thrust of a reserve is not able to pull a man that high. It only throws the pilot chute out about 15 feet.