Boozer Snoozer...
Sure, the rules for an airshow display are easy.
Display line is usually 200 metres from the crowd line (Avalon is a good example of this), and within 500 metres of the crowd in an arc / semi circle an aircraft cannot face towards the crowd (crowd in the middle of the circuit). Most non-aerobatic aircraft perform some kind of figure 8 with the ends of the figure 8 mean that they turn towards the crowd, however they are usually over 500 metres away.
If you do face the crowd within 500 metres and it's avoidable and looks deliberate and CASA is there (usually the case), consider that your last airshow display, ever! Many people do face the crowd when in a tight turn within 500 metres but if it looks safe it doesn't appear to be a problem.
The Roulettes are a blanket excemption to this and appear to be able to get away with facing the crowd at any time, overflying it or even completing a loop!!! straight towards the crowd. Potentially nowhere else in the western world is this allowed, yet our Roulettes are allowed to even though they have a habbit of crashing on the odd occasion. Last aircraft in training aero's was last year.
If you need to know more, just ask AeroAce60; he thinks he knows everything about airshows although he has probably never flown in one.