There was a
lost episode of the series that wasn't aired until after the
series finale due to some confusion and poor planning on
NBC's part.
The last episode, a two-parter called "Opportunity Knock Knocks", aired on May 13, 1992. NBC wanted to air the finale on this date so it would air at the height of Sweeps and therefore earn everyone involved a lot of money. In order to fit the finale in on this day the network skipped over an episode ("The 1992 Boat Show") that was originally scheduled to air on May 6, 1992 and held it until May 31, 1992 when it aired as a "bonus episode".
The episode did make it into the syndication package and subsequent cable rerun airings and it is aired in proper production order instead of broadcast order.