... and does so in a way that confused me. I'll get back to that.
Beaver joins a secret club that will not admit Beaver's close friend Larry Mondello. Hurt by the snub, from both his close friend and by the club, Larry joins a different exclusive club in revenge, one that sounds much more interesting than the one that Beaver has joined.
I liked how Ward explained the problem of lots of clubs polarizing a community in terms of castles and medieval societies with everybody locked away in their own castle and not working together, making them ripe for conquest by an invader. This lesson looks almost quaint today if you look at our very polarized American society.
Then, at the end, June and Ward are talking. Ward seems pleased with himself that he was able to reach Beaver with his tale of knights, castles, and invaders. Ward wonders how medieval people taught their kids lessons like this, and she replies that they probably talked about Levittown. I had to look that one up, and I'm not sure what she was trying to say. Levittown was a name for suburban communities built by William J. Levitt after WWII. They were built to be affordable housing for returning veterans. No controversy there. Apparently, though, Levitt refused to sell to black veterans. I'm not sure if this was that well known in 1960, but maybe it was an effort by the show to inject some current events and social relevance into the show, which was usually limited to child psychology.