When Tom opens his eyes and reveals the two billiard balls, the numbers are 8 and 6, or 86. "86" is an old food service slang term that means a menu item is no longer available that day.
This is the fifth and final Tom and Jerry cartoon in the Hanna-Barbera era to involve a sport.
As with most Golden Age cartoons, the attention to background detail is amazing, right down to the cue stick, chalk, and pool table corners.
In the years before product placement and promotional consideration, a nondescript yellow green soda in a glass capped bottle was about all that could be shown.
Tom slyly breaks the fourth wall, but only with his expression.