When the warehouse explodes, the tube used to launch the car through the roof can be clearly seen on the underside of the car as it lands.
The intelligent stealth tank is programmed to avoid people and objects (as demonstrated several times), but it runs into O'Neill at the end of the episode.
The rear-view mirror in the test car is supposed to move to follow the passenger's eyeline, as shown when Ed first gets in the car. Later on, however, the mirror remains fixed.