The CDC (Center for Disease Control) cited this episode for it's "teachable moments" at it's website:
Rule #1- Make a pit stop, fill up before it's too late. This comes from the scene where T-Dog is having to siphon gas from vehicles and the zombie horde appears.
Rule #2- First aid kit, never leave home without it. Another rule that originates with T-Dog cutting himself severly and getting a bad infection.