i doubt you'll have any problems. as mentioned above as long as there was enough positive pressure it'll keep the dust from entering and its a layer of CO2 even if you lost pressure so no oxidation worries there either. this is the reason most people use a blow off tube instead of the small air locks.
also a big negative on shaking the container just to get the hops, yeast, and the rest of the trub off the sides. whatever was cooked with the wort is basically toast now anyways. all your doing now is just having the yeast ferment and the beer start aging.