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.
Leave It To Beaver (1957)
Episode list - season 3
Starring: Barbara Billingsley, Hugh Beaumont, Jerry Mathers, Tony Dow
More mistakes in Leave It To Beaver
June Cleaver: Dear, do you think all parents have this much trouble?
Ward Cleaver: No, just parents with children.
More trivia for Leave It To Beaver
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