Proof Through the Night - S1-E4
Revealing mistake: As Airwolf flies at high speed across the countryside to get away from Russia, the shadow of the camera chopper can be seen on the ground, rather than the Bell 222 Airwolf.
Proof Through the Night - S1-E4
Revealing mistake: As Hawke uses the Star Light Amplification System to see where he's flying, the readout shows what he's looking at. The electronic compass readout at the top of the display doesn't move, even though the picture shows that he's constantly twisting and turning, following the terrain.
Proof Through the Night - S1-E4
Character mistake: Dominic said the MIGs were coming in 015° but the readout says 105°. If they were at heading from 015, the triangles representing them would be in the upper right quadrant of the radar circle, close to the zero.
Proof Through the Night - S1-E4
Revealing mistake: As the camera flies over the ranch and house (simulating Airwolf's flight), the camera chopper's left skid is visible in the lower left corner of the shot. Airwolf is a Bell 222 with added features, and doesn't have skids.
Answer: I don't think it's ever explained why Mac refused to tell Hawke where St. John is.