When Grandpa Unger wipes Oscar's mouth during the poker game, Oscar starts to laugh but put his hand over his mouth to block him smiling.
This was the first of several episodes in which costars, Tony Randall Jack Klugman would don simple makeup prosthetics and play their fathers/grandfathers
Oscar references Ajax's slogan 'The White Tornado' when he calls Grandpa Ungar 'The Grey Tornado'
The line, "Do me a favor, smoke towards New Jersey" comes from the play and movie versions of "The Odd Couple"