It used to be a lot easier to 'discuss' flypasts after the event before YouTube came along!!!
It is possible to perform v. low flypasts safely, albeit whilst breaking the rules, but also possible to satisfy the rules and regulations and be dangerous. Judgement is the key, both in the flying and the supervisory aspects.
The Buccaneer left its jet efflux in the water below about 40 ft and there was an urban myth that if you were low enough you could push the stick forward and the ground effect would prevent you from hitting the sea. Funny thing is that I never met anyone who had tried it!
Tommy was one of my QFIs at BFTS before he went to the F4 - small world.