Mr Light wrote:
What was the joke? I forget.
Essentially the Fantastic 4 subplot is a meta joke to this being the 4th season, along with all the other references to "4" (the logo of Fienberg, Fienberg, Fienberg, and Fienberg being blurred out). DeBrie's comment about Fantastic 3 and lousy 1 is a reference to one of the Arrested Development seasons being lousy, most likely the third season.