At the start after Nell leaves for work, a road is shown where people drive on the left side of the road instead of the right. In the next shot, she's on the right hand side of the road with cars passing her on her left (just before she almost has an accident).
Nell is based in the United States where people drive on the right side of the road. However, a brief scene is shown where people are driving on the left side of the road just before showing Nell in her car driving on the right side of the road.