Parachute scene is obviously a different plane than the DC-3: Look for black strip around top of door on jump plane but all white above DC-3 door. Parachute plane has shiny side, DC-3 has dull side. Also look for pilot to be at the controls on final take-off, then back in the cabin celebrating, then gone from celebration in next scene. Highly unlikely that pilot would leave cockpit as they had just taken off and were banking. Pilot easily identified because he wears shark teeth necklace though he alternates between tank-top and flight suit.
The men first set out on the trip in a Chevy blazer but when they stop to pick up the guns they arrive in a dodge ram charger.
The UZI is obviously a Mac-10 or similar, with some parts added to make it look like an UZI.
The opening shot is at night, then abruptly switches to a daytime shot of James Brolin inside a car while the radio broadcast heard during the previous shot is in the middle of a sentence.