A thirsty Wally goes into the kitchen to get some water and retrieves a bottle of soda pop from the refrigerator. After he goes back outside, June enters the kitchen and sees it's a mess. The bottle of pop is still full.
When Ward questions Beaver's policy of charging his friends for water on a hot day, Beaver asks his dad if the grocer, "Mr Michaelson", is his friend, why doesn't he give away his food for free. When his father answers, he calls the grocer "Mr Michaels".
When Ward Cleaver is talking to Mrs. Brown, she makes the comment that Beaver selling water could lead to communism. Ward comments that he doesn't think democracy is in danger. Communism and democracy aren't mutually exclusive, you can have both.
Actually, Mrs. Brown's comment that Beaver selling water could lead to communism is rather dumb since Beaver is using the free enterprise system.