Just after they dump the tacks out of the window, the Russians' car flies up into the air in a really quite impressive car crash. Just before it flips over though, you can see the huge ramp put in front of it.
The police car they use is marked as "K-9 - canine patrol". John Belushi's brother James was in a movie called K-9. He was meant to appear in this, but couldn't due to other commitments.