Over the summer Wally engaged in a romantic correspondence with pretty and high-class Kitty Bannerman, a young girl he met at summer camp. Through his letters he created the impression that he led an extravagant lifestyle, complete with a rich father, fancy cars, and birthday parties featuring Frank Sinatra. When June sets Wally up on a date with Kitty, Wally faces the terrifying prospect of having to eat his words!
Variations on this plot were used on I LOVE LUCY, THE HONEYMOONERS, THE ANDY GRIFFITH SHOW, and I'm sure many others (in fact, the ANDY GRFFITH "Floyd the Gay Deceiver" has strong parallels with the present BEAVER episode). "Wally's Glamour Girl" follows the formula to the letter, but we also have a bit of a surprise in that it's Wally at the center of this crisis; usually it's Beaver painting himself into a corner with his wild fibs.
The episode has some very funny moments: Wally reading his wildly exaggerated letters in that deadpan tone of his; Beaver enjoying a chance to act smug for a change at his brother's predicament. Wally's relationship with Ward is also a key theme of the episode. Ward, after he learns about Wally's situation, lends his support to his son and at the end Wally reflects that his father is "one of the best friends he has." The girl playing Kitty is perfectly cast.
Perhaps it stretches credibility that guileless Wally would misrepresent himself the way he does in this episode. It seems more like the sort of thing Beaver would do. Certainly, if this episode had occurred a season later it would have been much less believable; but at the age Wally is here, and under the spell of a pretty female, who knows?
The plot may be well-worn, but it's done here in a sweet and wholesome fashion that only LITB could pull off.