In this episisode clues to the location of Mayfield are given when Ward tries to calm June's anxiety about the boys' use of the boat by saying, "...the ocean's 20 miles away..."
When Beaver goes inside to ask about riding in the garbage truck, you hear the horn of the garbage truck signalling Beaver to come. But when Beaver runs outside, Mr. Fletcher is standing behind the garbage truck holding a garbage can. He couldn't have honked the horn.
Although Leave It to Beaver has a reputation for being unrealistic, I think that Wally's reaction to his mom for setting up the date was pretty normal in this episode. The fact that he yelled at her and confronted her for not asking him first was suprisingly confrontational for a show that was supposed to be so conservative.