When the crosswalk signal changes to WALK for Amanda, it can been seen ahead of her across the street. The scene then swings right to show the crosswalk signal (with the light showing green) also showing WALK. This is not a mistake, it shows that Amanda is walking into traffic that still has a green light. After almost being hit she looks around and sees that ALL the traffic lights show green, which is the result of the hacker.
In 1998, webcam technology had not advanced to the point of being able to show full range motion as it appears in this episode. The Jennicam, which The Joannecam is based on, only offered a still photo, refreshed every three minutes. At this time experiments were being done with full range motion, but they only resulted in blocky, jerky, stop motion actions.