The diabetic tree chopper's hat says Toppel tree service. This is a reference to the show's Greens Foreman Debra Toppel.
Matt Trudeau, who plays the Canadian firefighter Gavin in this episode, returns in a Season 7 episode playing Lt. Trey Jennings.
The story line involving the mother with Munchausen by Proxy who was poisoning her young daughter is loosely based on the case of Lacey Spears who murdered her 5-year-old son Garrett-Paul Spears by repeatedly injecting him with salt.