Goof...not necessarily
Listed under Goofs is the fact that Mona was told Johnny was home sick but when he asks why his son is home the answer is because it's Saturday. This might be a mistake now but not in the 1940s and 1950s when many insurance offices were open on Saturdays, at least in the morning.
Jim Anderson (Father Knows Best) routinely had his insurance office open on Saturdays. It is so routine that there a comments in some episodes when he takes a Saturday off. Coincidentally, Jane Wyatt was the wife here, too