Harsher in Hindsight: Episode "Getting MADD" features a car accident where two teenagers are almost killed in a car accident and they survive. But the actors that played them both died young. Julie Patzwald commited suicide after suffering from chronical pain (32 years old) and Michelle Skalnik died from natural causes at age of 27.
Most Wonderful Sound: The whirring and clattering of the Defender deploying its armor from season two onward.
Mythology Gag: The hint might be unintended, but in "Aftermath" a character says "If the Cops are real, the car is too!" when he was approaching a road block. Knowing that the Viper team was not an official police unit in Season 1, someone could find it funny.