Other mistake: In the opening, when they get into the car, it's obvious that there is no glass in the rear window.

Leave It To Beaver (1957)
1 other mistake in season 4
Starring: Barbara Billingsley, Hugh Beaumont, Jerry Mathers, Tony Dow
Wally's Practical Joke - S6-E35
Visible crew/equipment: When Eddie Haskell comes over to scheme getting back at Lumpy, just as Eddie, Wally and Beaver are heading up the stairs, a mike boom is visible in the upper left corner.
Theodore "Beaver" Cleaver: You know something, Wally? I'd rather do nothin' with you than somethin' with anybody else.
Trivia: Phyllis Coates, who plays the new neighbor Mrs. Donaldson, played Lois Lane in the first season of the Superman TV series in the 1950s.
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