Continuity mistake: In a close up shot, we see Ernesto's hands holding a nutcracker. In the following long shot, he holds a different nutcracker. (00:11:50)
Continuity mistake: Ernesto is wearing a red shirt and a brown jacket. The sleeves of the jacket are quite high up the arm, so that the sleeves of the shirt are visible. In the following close up shot, the sleeves of the jacket are not reversed, so the sleeves of the shirt are completely covered. (00:37:05)
Other mistake: Jill is riding a skateboard and she holds a little black bag in her left hand. In one shot, Jill's hand is empty and the next she is holding it again before throwing it at Kelly. (00:45:00)
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