The third child, Henry, is noticeably missing in a scene. When the family sits down for dinner in the final moments, there is no place setting for a sixth person, just for Sean, Claudia, Lily, Jimmy and Eddie. The character of Henry was written out of the show after Jake Burbage, who played him in previous seasons, left the show when his family moved from the Los Angeles area.
The episode title is a reference to "The Letter", released in 1967 by The Box Tops. This song has been covered by multiple artists, most notably by Joe Cocker in 1971.