In the victim's home movie that Vera and Jeffries are watching, two modern vehicles can be seen passing in the background, despite the video having been shot the day the crime took place in 1987.
After the playground shooting, the gunmen pull over on a drawbridge to throw the gun into the water. Though the show is supposed to take place in Philadelphia, the dark shadowy, but distinctive outline of a California State Highway marker shield is clearly visible on the side of the bridge.