Continuity mistake: Kelly, Sabrina and Bosley are in the office. All three are very worried about Kris, since they don't know where she is. Sabrina says, "Her car is not there". Actually, the previous shot has shown Kris' car (Cobra II) parked in front of the office. (00:06:45)
Other mistake: There are at least three mistakes/errors in the scene where Kris is hit by the car. First of all, the image is evidently sped up during the collision. Then, when Kris gets up after the collision, there are three green trash bins in front of her which did not appear in the previous shot. Finally, it is physically impossible that those three trash bins can still stand after being hit by a car. (00:03:40 - 00:04:20)
Answer: After going through a number of cast changes that failed to improve the show's slumping ratings, Tanya Roberts' character was added as "street-wise" former model. This was probably an effort to give a different and edgier character dimension to the show.
raywest