There is a scene where Harry and Lloyd talk:
Harry Dunne: How many days are in April?
Lloyd Christmas: 30 days have September, all the rest I can't remember.
Harry Dunne: Must be 31 because nothing rhymes with August.
Lloyd Christmas: Nah, I think it's 32, Harry. April's a leap month.
What's Harry talking about when he said "Nothing rhymes with August"? And what's a leap month? And what is Harry mention August for ?