This aircraft should never have left London.
Isn't hindsight wonderful?
The 380 has a long history of noisy doors due to a particular design feature. Would you expect, in these circumstances, to have a full NDT inspection after every noisy door report?
As a result of the DC-10 accidents, floor vents were retrofitted on all the widebodies of the time. I'm not sure what modern design practice is used to address the situation; anybody "in the know"?
Rest assured, all airliners now have blow out panels fitted at floor level to equalise cabin/hold pressure in the event of a failure.