The "serial killer" store has a card collection of serial killers. One card shows "Dwayne Moore" (aka "The Cabbie Killer"), a reference to the "Cabbie Killer" story arc from Season 4:
- Like Water for Murder (2008) (#4.17).
- Personal Foul (2008) (#4.19).
- Taxi (2008) (#4.20).
The "serial killer" store has a card collection of serial killers. One card shows "Ashley Brown". Later, when they get the list of people who purchased the Lambert soil, the first name on the list is Ashley Brown.