You can find yourself well below stalling speed while doing aerobatics without actually stalling. E.g. at the top of a loop you may only be pulling 0.5g which means you can fly below the stall speed. The reason is that the wings are only carrying half of the aircraft's weight and have a low angle of attack. You are still flying in the sense that the control surfaces are all effective, but you are not flying in that the aircraft is no longer fully supporting its own weight.
In a similar vein to the 727, we used to do stalling exercises in a Pitts which involved stalling with some power on (about 1500rpm from memory) and holding the stick back as if entering a spin. However you use rudder to prevent either wing from dropping, lots of very quick precise rudder. I\'ve never looked at the ASI while doing it because if you don\'t look out the front you very rapidly lose it.