Factual error: In Sue Ellen's resume that she types up, the zip code of GAW is revealed at the top of the page as 90042. GAW is later shown as being in the Downtown LA area. The zip code 90042 is in Highland Park - a suburb several miles away from the Downtown area.
Factual error: When Sue Ellen is shown commuting on the 405 freeway during heavy traffic, she is heading to work, indicating morning - yet the angle of the sun and shadows show it is late afternoon.
Answer: People in LA commute in all sorts of directions for work. And the freeway you see is the 405 in West LA (not the "city" - or Downtown where she worked). This freeway would not even be her direct route anyway. All just made up in the film.