Cargo Door Access Panels and Ground Power Panels
As far as I am aware there is not indication in the cockpit (A330, B757, B747, B737, A320) if the Cargo Door Access Panels or the Ground Power Panels are left open.
With the design I would assume that the force of the wind upon takeoff would automatically shut these.
Any cases where this has not happened? Do you feel vibrations or are they negligble?