Physics Fail in Record-Setting Car Jump Attempt

Everything seems to be fine for the first two thirds of the flight. But then the sound of the engine dies and the car starts to rock forward. Those two things are intimately connected.

This is something I noticed in the animated movie The Incredibles, where they got this part right, despite all of the suspension of disbelief required elsewhere in the movie: when the van drops free of the rocket, Mr. Incredible stomps on the gas and the van tilts back, which is at least qualitatively what you’d expect.