Bent wheel cover
Looking at that gear retraction / lowering video, if that little green clip had failed the flap would not be pinned back and the gear would have fouled and bent the door when it was lowered. The problem would not be discovered in use until it was retracted again after take off.
The question I have is: should there be a visual inspection done of the aircraft before takeoff? Do the flight or ground crew have to look for such damage? Being as it is under the wing but still plenty of headroom it would have been visible for anybody looking for it.