Revealing mistake: When the purser's safe falls through the ceiling, the ceiling metal is far too thin. Bearing in mind also, that the on the other side of the ceiling metal is supposed to be the floor of the next deck up, and that too is a thin flimsy metal, that doesn't even appear that it could support any kind of weight.
Visible crew/equipment: A woman runs away from a hospital. When she runs past a wrecked vehicle you can see the shadow of a camera. (01:17:00 - 01:17:50)