He was testing new material on an audience, most of those notepad jokes ended up in the polished routine. Lot's of comedians will workshop their jokes first on

He was testing new material on an audience, most of those notepad jokes ended up in the polished routine. Lot's of comedians will workshop their jokes first on a small crowd, though it does leave you wide open to having them "borrowed" by other comedians before you work them into your act.