Via Nodwick, I get the impression that these items derived from that little throwaway bit in Fight Club
Anyway, the conceit of the Comfort Guides are fairly obvious: they’re little emergency fold-out visual aides for tricky situations. Note that the image is from the zombie one, which is apparently has been done in the context of helping the zombies: clearly, the authors have recognized the unique educational problems faced by the Undead. The parts of the brains that handle the written word must be the tastiest, or something.