During the square dance, right after the announcer says to do the "star" formation, Yardley accidentally strikes a female dancer in the face with his hand (neck and chin area) while struggling to turn his big body around. The lady is momentarily knocked backward in a whiplash motion but maintains her poise and smile throughout.
Several days prior to Christmas, a magazine publisher says that a food writer at a rival magazine is scheduled to give birth nine months later in September, even though it would be impossible for him to know that in the third week of December. In 1945, doctors could not detect pregnancies until four-six week after conception.
While waiting for Elizabeth to return from Yardley's estate on Long Island, Dudley tells John she's at Grand Central Station. First of all, any New Yorker knows it's called Grand Central Terminal. Second, trains from Long Island come in to Manhattan at rival Pennsylvania Station.
Yardley tells Sloan that Elizabeth's rival at another magazine has announced she is going to have a baby, and Yardley states that they have to beat her to the punch, as they will surely lose readership. Even Yardley can't do anything about nature- it still takes nine months to have a baby, so it would be impossible, even if Elizabeth conceived on the first night of marriage. Additionally, if they actually managed to have the baby before the woman at the rival magazine, it would naturally appear that Elizabeth had conceived before she was married.