... since there are plenty of tie-ins with the original Leave It To Beaver series.
June awakens to the sound of Beaver's two sons fighting over a shirt of Kip's that Oliver is wearing. Then Beaver enters the fray when he sees Kip is wearing one of his shirts. June ends up going next door to Wally's house when she gets locked out of her own with the boys still upstairs arguing, and is asked to watch Kelly for the day, since she's out sick. When Kelly admits she is faking a bit, June takes her on a drive to where she lived as a girl, and then recounts the night she and Ward met.
The rest is a flashback to 1944 when June worked at the USO and where young Ensign Ward Cleaver first sees her and is taken with her smile. These two actors really do act and speak like you'd imagine Ward and June would have in their youth. But the scene stealer is Kerry Stein who impersonates Fred Rutherford as well as the marvelous Richard Deacon did in his day. Apparently Fred and Ward met in the navy.
You get to see why June probably prioritized dancing school for Wally and Beaver so much - It's a wonder both of her feet weren't in a cast after a dance with Ward, and an interesting factoid is that character actress Irene Tedrow is playing June's aunt Martha. Tedrow played Aunt Martha's traveling companion, Mrs. Hathaway, in the LITB season two episode "The Traveling Aunts".
As a long time viewer I admit there are some inconsistencies here - In the original LITB Ward had mentioned he was a Seabee and spent the entire war in the Pacific, and in some places in the series it was said Ward and June met in college and in other episodes it was mentioned they grew up together. However, this episode is very true to the spirit of the series and the characters and it is quite magical.