The crash involving the trailer with explosives would not have occurred as shown since it was a 4-way stop intersection. Rear-end crash airborne vehicle impossibilities aside, the vehicles would not have been going fast enough to fly through the trailer as shown since they would have been preparing to stop.
While in the Sergeant's office, Sgt. Getraer tells Jon and Ponch that the Auburn they were chasing or one like it was stolen in Santa Barbara. As later revealed, the owner had died and the person making the theft report (his nephew) had no legal standing to do so since he was not the owner or executor. The Santa Barbara police would not have listed it as stolen.