The first noted use of an ACME product in a Warner Bros. cartoon.
Boxing (known as "the fights") was a very popular spectator sport when this short was made. Apart from baseball, professional sports as known today were still in their early staged of development. And as there was no TV yet in homes, radio broadcasts were the order of the day.
At the time of this short, the U.S. postal service moved bulk mail largely by train. Airmail was a special service that required extra postage and special lightweight stationery.