This video is not necessarily showing you every step you have to take to model a car but it is highlighting the necessary steps to take when modeling a vehicle in general. This is a very detailed model but I believe it is highlighting the main point when it comes to modeling a vehicle; using surfaces to have a better design for your car.

EASE IN & EASE OUT
This is another principle of animation and the best way to illustrate/explain this principle is when a object gradually accelerates, or comes to rest, from a pose. As I stated earlier in squash and stretch, the best example is a bouncing ball because as it goes up gravity affects and it slows down this is when easing in occurs in the ball. Easing out occurs in a ball when it starts its downward motion much more rapidly until it hits the ground.

Reference Links:

http://www.dgp.toronto.edu/~patrick/csc418/notes/tutorial11.pdf

http://www.siggraph.org/education/materials/HyperGraph/animation/character_animation/principles/slow_in_and_out.htm