Beaver's elementary school was Grant Ave. School, which was a grammar school, not an elementary school; meaning grades K-8.
The house on Universal's backlot that was used for the exterior shots of the Cleavers' second home (in Season 3, after the move to ABC) was later used for the exterior shots of Marcus Welby's house. in Marcus Welby, M.D..
This show made its debut on the same day the Soviets launched Sputnik (4 October 1957)
In the pilot episode, the part of "Frankie" was played by a young Harry Shearer.
This was in a way the first show to show a toilet and in a way it also wasn't. They didn't actually show the toilet pedestal and seat, but they did show the toilet tank and flush handle.
Larry Mondello's sister, although talked about, is never shown. His father is shown in one episode when all the kids gather back stage after the school play when Larry played a hop toad.
When filming was shifted to Universal's backlot (then known as Universal International) a new house was built. This house remained as a standing set and was later used for many other television programs and motion pictures. It is a popular attraction on Universal's Tour. More than forty years after the show ended, the still standing set is known as "The Cleaver House."
In addition to his role as Ward Cleaver, Hugh Beaumont also did some writing and directing for the series.
The character 'Ward Cleaver' was ranked #28 in TV Guide's list of the "50 Greatest TV Dads of All Time" (20 June 2004 issue).
The character Eddie Haskell was ranked #2 in TV Guide's list of "TV's 10 Biggest Brats" (27 March 2005 issue).
Eddie called everyone "Sam".
Richard Deacon's appearances as pompous Fred Rutherford diminished in the last season as he was also portraying Mel Cooley on the The Dick Van Dyke Show at the same time.
Sponsors of "Leave It to Beaver" include General Electric Lightbulbs and Purina Dog Chow.
Barbara Billingsley told an interviewer in 2007 the reason she always wore pearls on camera is because of a small indentation just above her sternum that didn't photograph well.
There are two indications that the Cleavers lived in Wisconsin. In one scene, Wally mentions the high school band is going to Madison to play for the governor. In another episode, the Cleavers are going to a pro football game and repeatedly refer to the Packers.
Although the series was still earning good ratings, its star, Jerry Mathers, wanted to retire from acting to focus on his education upon entering high school. As a result, it was agreed to halt production, and the series became the first primetime American production to have a series finale.