The first mention of Jellystone Park, later the home of Yogi Bear.
The logo of Bell Telephone appears outside one of the telephone booths.
Barney's cousin, and his fondness for picnic baskets, might well have been the inspiration for Yogi Bear, who appeared a few years later.
Alum powder is most commonly used as an astringent. It is an ingredient for pickling produce, and is also found in baking powder as well as styptic pencils.
The telephone booth and chain trick shown here is a likely nod to renowned escape artist Harry Houdini.