Car

The side mirrors: We copy the faces from the corner of the window (before mesh smooth) and we detach them from the object. We apply edit mesh and align them as in this image:

Next comes a mesh smooth and a edit mesh. Select the central faces and extrude them like this:

Then select the faces that will represent the mirror and extrude give them another ID. Then mesh smooth the object.

The windshield wipers are build from boxes modified with edit mesh and bend (because the wind screen is curved). The boxes that you create must have plenty of faces for the Bend modifier to work fine.

Next comes the plastic thing( don't know the translation sorry :) on top of the car. One thing is done from a box that is edit meshed.

After mesh smooth: