The cast members had suggested that the series end with the whole family dying in a plane crash. They wanted no possibility for a reunion special.
Skippy says that the army is in his blood, and goes on to mention a Handelman relative. But Skippy is adopted (See Baby Boy Doe, Season 2).
When in the hospital, worrying about Stephen, Elyse says that she has a six-year-old boy: Andy. Elyse had Andy towards the end of Season 3, so Andy should be only 3-1/2 years old.
At the end, during the montage of family time, there are times when everyone in the family is shown, yet the camera is moving as though someone is holding it.