During an interview on the January 31, 2007 episode of The Skeptics’ Guide to the Universe, Teller claimed that the final episode of the show would be about “the bullshit of Bullshit!” and would detail all the criticisms that they themselves had of the show, however the series ended before such an episode ever aired.
From Wikipedia:
Oh. What a pity. I guess the network didn’t think it was worth spending money on.