The salesman in the sporting goods store is the same actor, Eric Snowden, who teamed up with Aunt Martha in a clothing store, to get Beaver's favorite jeans away from him, and dress him up in "sissy" clothes, in Beaver's Short Pants (1957).
The sporting goods store, Abernathy Potts, is based on Abercrombie and Fitch, a famous high-end sporting goods store in the '50s.