Alright, did some reading. Looks like Canada was DQ'd for something unrelated to the crash. Just before the crash, seems a Canadian (not sure who) got off track and got into the way of a Chinese skater. And China got disqualified for using 'her hand' at the end of the race, whatever that means...
On the other hand, supposedly a Korean skater who isn't in the race and circling to get tagged in cut into the lanes causing the Canadian who is in the race to slow down and therefore letting the Korean (racing) to pass her...then just a bit after the fall happened.
Course, the falling Korean who took out everyone should have been DQ'd as well...So, unless what I'm reading is incorrect, Korea had two incidence that should have caused their disqualification.