Abbott and Costello do their "Who's On First?" routine.
The version of "Who's On First" in this episode is widely considered to be the most definitive version while the version in their movie "The Naughty Nineties" is widely considered to be the best ever recorded version.
Bud and Lot are each given a $500 dollar bill by a millionaire. The $500 bill was first printed in 1861, and the last one was printed in 1945, eight years before this episode aired. The bill was formally discontinued by the U.S. government in 1969.