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Okay, so, I've just solved half of these (movie-wise), purely incidentally, and of course, right after I asked for help. That happens every time. 
Turns out the Crown Vic jump, Intrepid/Impala collision, smushed Corolla wagon, and flipped Econoline, were all from season 2 episodes of the Steven Seagal TV show TRUE JUSTICE.
If you wanted more fuel for your Seagal hatred, think of that poor Corolla... that'll do it.
And yes, I confirm that the Crown Vic didn't just turn into an Intrepid.
What happened was, the Crown Vic and the Intrepid were doing a game of chicken. The latter lost and crashed into the Impala.
Turns out the Crown Vic jump, Intrepid/Impala collision, smushed Corolla wagon, and flipped Econoline, were all from season 2 episodes of the Steven Seagal TV show TRUE JUSTICE.
If you wanted more fuel for your Seagal hatred, think of that poor Corolla... that'll do it.
And yes, I confirm that the Crown Vic didn't just turn into an Intrepid.
What happened was, the Crown Vic and the Intrepid were doing a game of chicken. The latter lost and crashed into the Impala.