Steve jumps over the cliff to avoid the mercs' plane, and so the cliff-side is behind him, yet he then jumps back up to the top of the cliff without turning around.
During the wide-angle shots of Steve's wingwalking-practice flight, he is shown to be just strapped into the acrobat's chair in a normal upright position, yet he is shown to be hanging inverted (upside down with relation to the seat) in a close-up shot.
Steve uses a rope ladder to disable Dimitri's plane by throwing it into the propeller, stopping the rotation. When Dimitri's plane is landing, the propeller is rotating.
The plane Steve flies changes from single to double seat and back. Sometimes Steve is shown operating plane on ground he is in front seat. Pilot is controlling hidden in back seat.
During the plane chase, the shadow of the film crew helicopter is visible next to the shadows of the two planes.