Deliberate mistake: Watch the head to head scene of KARR and KITT. Just as KARR veers off, watch in slow motion frame by frame. The KARR switches to a classic automobile before the dirt scraping and cliff fall.
Continuity mistake: Michael fights for his life on KARR. He then jumps to safety on KITT and gets into the car and goes chasing after KARR. The next scene has Michael back on KARR fighting for his life.