Visible crew/equipment: As Blue Thunder performs its loop just before the bad guy's helicopter is destroyed, there is a shot of him looking around in his helicopter. In this shot you can see the camera helicopter reflected in the glass.
Visible crew/equipment: When Blue Thunder approaches the chicken shack, you can see an entire camera crew on the roof of the building across the street. (01:31:45)
Visible crew/equipment: The helicopters are flying low above the streets chasing each other. Several forward looking shots show no to very little traffic, and one blatantly shows two cops directing traffic away from the set of the film.
Answer: Yes to A, B, and C.