I just got done watching the "Ebbtide for the Defense" episode which originally aired on October 16, 1992. I noticed that the copyright date at the end of the episode was 1991. Was this a typo? I don't see how the episode could've possibly been filmed in 1991.

Had to be a typo considering that Golden Girls was in its final season in the fall of 1991. I am not even sure Golden Palace had been conceived by that point.