Trivia: In Walker's Drugstore, among all the magazines by the wall there's a TV Guide magazine (from Oct 9, 1954) on the shelf, and on its cover is Lucille Ball the co-owner of Desilu Productions - which produced TAGS, and also filmed at Desilu Studios.
Trivia: Howard McNear who played Floyd The Barber was the barber in Leave It To Beaver, Season 2, The Shave.
Answer: Those "boxes" are valences that used to be very common, before air conditioning. They allow for windows to be open during rain storms. They permit air circulation, without letting the rain in.