This was interesting to watch today. I muted the television set for the most part but still learned that chocks might be tangled in the landing gear door, the emergency blow-down system is actually an explosive system which uses an explosive charge to blow up...and then I guess...blow down the landing gear and that "There were 7 people on the airplane, 4 high ranking Nike officials and three other people of some kind on board."
My guess is the main gear slammed into the gear door upon initial retraction, got stuck there and didn't come back down when they reselected gear down. The airplane landed with that gear door hanging so I think it's safe to assume they hit with a pretty good thump. Also the inboard wheel on the right main looked to be damaged while taxiing in.
Good show...and the talking heads don't get their "big fireball" as some newsb1tch so nicely put it.