The final short where Bea Benaderet voiced Granny. Starting with Red Riding Hoodwinked (1955), she would be voiced by June Foray.
Granny's historical bathing costume dates back to the early 20th century.
Granny mentions her bikini bathing suit. Although the bikini hadn't yet become hugely popular in the US, it dates back as early as July 5, 1946 in postwar Europe. The bikini would have its heydey in the California surf craze of the 1960's, though it continues to be celebrity swimwear of choice in the 21st century.
Tweety is shown wearing the latest (for the era) style of fashionable sunglasses.
The curious inflatable item Sylvester blows up was known as a water wing flotation device. It was a popular novelty for non swimmers at the time.