No sound but great video close ups by the NTSB...
At time 2:55 it looks like tire skid marks on the blacktop where the plane took a hard right off the runway. Wonder is maybe something went wrong with the braking system that made it take a hard right turn after they touched down.
And why was there a piece of plexiglass in the grass field. Stuff breaking off from a very hard landing perhaps?
If they hit the ILS antennas or lights before the runway, they were out of control by the time they reached the approach end. If they hit some structure or dug in with the right wingtip, that would veer the airplane to the right, hard. The plexi could be from the underslung ball turret which doesn't clear the ground by a lot, or nose glazing if it made contact with the raised ILS structure(s).