Continuity mistake: When Jessica (a stunt double) rides her bicycle at the start, her red scarf is tied around her waist. A shot later, when the real Jessica is shown, the scarf hangs around her neck.
Visible crew/equipment: When Jessica gets trapped in the car, lighting equipment is reflected on the window.





Answer: It may simply have been a matter of time, as this was a one-hour show. The murderer is always revealed at the end, though it is not necessary to show the actual murder. Also, at that that time, it may have been considered too graphic to show someone being stabbed on a family TV show.
raywest ★