I've only seen that footage from their site, but as I say, moving the frame indicator back and forth, easily shows the aircraft moving past, right to left.
The fact that it moved the entire distance in one frame, just shows how fast the plane was skidding across the ground.
With the landing gear still retracted, the entire fuselage could easily have stood less than 14 feet tall.
You mean that ssmall white blob only visible in the first frame? IMO the tail is not visible since the object, which could pass for a tail fin, in visible the successive frames. As far as I could see the only change looking strictly at the right hand side of the sequence is a white blob at the beginning.