Revealing mistake: When the tunnels start collapsing, all manner of buildings come crashing down; one of the buildings, upstairs, has a couple in bed; they come flying out and they land face-down with the bed on top of them. We can see the man is tied to the bed - to stop him being injured, I assume. In the next shot, the bed is on the ground and the couple are lying on top of it.
kh1616
24th Mar 2016