<<and voila! another loose bolt... >>

I bet these guys torque wheel lug nuts to 200 Ft. lbs.! Amazing shortage of brain cells some days. Anyway, glad it was nothing serious. Of course that kind of event can cause you to wonder about other things for a while. If I were you I'd spend some time and check for other things they may have touched. I'd also give them a call and let them know what you found. No sense letting them get away with being ignorant.