The title of the show refers to Jonathan and Jennifer's surname, but it is also a play on the phrase "heart to heart", referring to the couple's obvious passion for one another.
One of the recurring trademarks of the series was that the word "Hart" was included in every episode title, usually as a pun on "heart".
The Harts had a pet dog named Freeway. Naturally, Max was in charge of feeding the animal and cleaning up its poop.
Mark Snow worked as a score composer on ninety-one episodes from this series. Snow is most famous for his catchy little whistling theme from The X-Files (Admit it. You just whistled it in your head right now, didn't you? It's impossible not to).
Jon Koslowsky worked as an editor on eleven episodes of the series.