Margaret's line, "Oh, Frank, how can we eat when others may go hungry?" was obviously looped later.
In the opening scene there is a reference to mouth-to-mouth resuscitation.
CPR was invented by Austrian surgeon Peter Safar. He didn't finish medical school until 1948; and hadn't begun teaching the technique of CPR until the late 1950s to early 60s, after the Korean War had ended. Mouth-to-mouth wouldn't have been a term used in this time frame.
During the meeting at the beginning, Frank Burns asks, "What would have happened in 1776, if the minutemen on their way to Concord, had stopped to worry about toilet paper?" The Battle of Concord began a year earlier in 1775.