Visible crew/equipment: While Wally and Beaver are at Sunday school, June and Ward go to the boys' bedroom to see how messy it is, and two chalk T-marks are visible on the floor where both Ward and June will stand. (00:21:10)
Leave It To Beaver (1957)
1 visible crew/equipment mistake in Beaver's Old Friend - chronological order
Starring: Barbara Billingsley, Hugh Beaumont, Jerry Mathers, Tony Dow
Other mistake: The opening credits for season 5 show June coming out of the front door with a pitcher of what looks like iced tea, and calling for Ward, Wally and Beaver who are all working outside. But the door opens by itself as she comes out, and then closes by itself behind her. If the entire family is outside, who opened and closed the door?
Eddie Haskell: Look Sam, if you can make the other guy feel like a goon first, then you don't feel like so much of a goon.
Wally Cleaver: I don't get that.
Eddie Haskell: Of course you don't. That's because you never went to kindergarten with a home permanent.
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.