De acordo com este post do Quora começou como uma coincidência, mas os criadores gostaram da ideia.
The show creators Vince Gilligan and Peter Gould mentioned in one of the insider podcasts that this started out as a coincidence, but once they noticed it for a few episodes they tried to do it intentionally for all of them because they knew fans would notice.
The episode titled "Jello" was changed because they didn't have rights to it since it's trademarked.
A fonte dessas informações é este podcast interno .