Three things stand out in this good episode: 1 - appearances by Ken Osmond as "Eddie Haskell," a few scenes with the ultra-nerd and funny Richard Deacon as "Fred Rutherford," and the nice, practical message/moral at the end of the story.
Regarding the latter, this was always one of the strong points of this show and I don't think fully appreciated until later years. Do sit-coms do this today? I doubt it. Here, the message is that parents calling their kids an insult like "stupid" can do more damage than if they had even hit the kid. Words like that, as Beaver says in this episode, can stay with a kid for years.
It's Ward who learns the lesson after his kids make a mess of his garage and leave it that way, so he can't get his car in. This happens for two days and dad is really ticked off and lets the kids have it. When the boys do clean it up, they discover a nail they left in the driveway punctured and flattened a tire on dad's car. Yikes! What do they do now? Eddie Haskell, believe-it-or-not, to the rescue (sort of)!