First, we should doubt the source, since the actors' own Twitter account can't be completely trusted (why would you pull a whole episode instead of just the controversial scene? what if it was just a promotional resource?)

Prior to the release of the episode [some sources][1] echoed Cudlitz's account and wondered if it could be violence, sex, cannibalism or the F-word.

Even after the release of the episode, [it was unclear][2] if or what was wrong with it. What could be "too much" in a show about zombies?

So my guess is, as [this source][3] says, that

> Cudlitz was probably just exaggerating for the sake of a good tease

[1]:http://comicbook.com/2014/11/09/the-walking-dead-self-help-episode-was-almost-pulled-by-censors/
[2]:http://www.cinemablend.com/television/Walking-Dead-Episode-Was-Almost-Banned-By-AMC-68311.html
[3]:http://www.wetpaint.com/walking-dead/articles/2014-11-09-season5-censors-almost-pulled-episode5