I was involved in the organising of another Air Display some years back. During the course of the day, and despite the event being NOTAM'd months in advance, and despite the fact that there were thousands of people on the ground, and 10-15 aircraft parked on an otherwise disused airfield, 2 light aircraft flew straight through the display causing an RAF Hawk and a civvie Mustang to break off from their displays.
Unfortunately for the 2 pilots involved, a CAA man was there...
He managed to trace one of them by calling a nearby airfield where his mate worked, and he got the aircraft followed on radar.
Not sure if they got taken to court, as there wasnt any TR airspace in force, but I think they certainly got their knuckles rapped for poor flight planning.