According to Barry, the entire cast was unhappy with that ending during the first table read, except for Christopher Lloyd.
In an interview with Yahoo! Entertainment, Barry explained how, with some nudging from Anjelica Huston, Christina made a really thoughtful case, saying, "Christina explained to me how the audience would be left emotionally adrift if it wasn't the real Fester. Does that mean the real Fester is still out there? And how could Gomez just give up his search for his brother after all these years just because this imposter came into their family?"