Near the end when Jessica holds up the credit card receipt for Wilhelmina Fraser, the date shows "1/19/86", which is the same as the original airdate of the episode.
The title comes from the patriotic British song from World War I, "Keep the Home-Fires Burning ('Till the Boys Come Home)" written by Ivor Novello.
The politician threatens that Mr. Hawthorne is getting "dangerously close to libel" for accusing the politician of being "crooked", Libel is a charge for false written statements. If anything, Hawthorne would be guilty of slander, but as he correctly points out, only if his statements are false.
Mr. Dupree, the chef, sarcastically refers to Jessica as 'the Julia Child of Cabot Cove' when Jessica comments on how the food could have poisoned the dead woman. Julia Child was a famous American cook and television personality, known especially for her French cooking, who passed away in 2004.