The portrait of Mr. Burns Marge painted in "Brush with Greatness" appears in a hall in his mansion.
Mr. Burns' social security number is revealed to be 000-00-0002.
In one scene, Lenny drinks from a bottle of rubbing alcohol. In fact, rubbing alcohol is twice as toxic as ethanol, so consuming it will double the chances of harmful effects such as alcohol poisoning. Symptoms may include blindness, stomach pain, confusion, dizziness, slowed breathing and, in severe cases, coma and/or death so therefore Lenny could have possibly died from consuming it.