When Airwolf is firing with its machine guns which are mounted and fixed, you will see a scene where the gunfire is going straight to a truck as Airwolf is banking which is impossible.
During the opening sequence the footage of the Beechcraft Super King Air 200 in flight is reversed. The tail number N84B reads backwards.
When Dom is loading a CD-ROM in Airwolf's data drive he was working with buttons marked "Fuel Line Heaters" which obviously aren't part of the computer data system.
During the cockpit view just before Kate and String are about to land, the shadow of helicopter rotor blades is seen. But they were flying in a Beechcraft King Air fixed wing aircraft.
Near end of episode when Marcella is taking off after picking up the kids for their escape in the twin prop airplane, a two man camera crew is visible on left side of runway just as the plane leaves the runway.