The F-4's that chase Airwolf alternate between being F-4's and A-4's.
When Airwolf shoots down an MD500 it changes from a "T-Tailed" type in flight to a "V-Tailed" type as exploding wreckage.
At the beginning, when Airwolf starts descending from 86,000 feet, Santini is calling out the altitudes. He says "84,000 feet", then "80,000 feet" at which point there is a shot of the altitude gauge. However, the gauge shows them ascending from 79,000 to 80,000 feet.
When Airwolf shoots down each of the American jets, the same footage is used for the explosion.
The pictures of the SAM's that chase Airwolf occasionally reveal the support holding up the prop.