Lloyd went to get some yeast. He's making home brew. By this time, beer is legal again. Prohibition ended just a few years earlier. Lloyd and Mary had some brewing experience from that time.
It's also so hot that naps are in order and the kids slept downstairs during the night. Remember the days before AC? The upstairs could get unbearably hot after a day of hot sun.
Nellie gets the news that Mary is pregnant. Surprise! Oh, and in the margin: "The kids got a dog." Guess that is two surprises.