Sketchy states that before the apocalypse, he, as Assistant Fish and Game Warden for the District of Columbia, was the 192nd person in the line of succession to the presidency. Since an official of the District of Columbia is not a federal position, he would not have been in the presidential line of succession.
Inside the Wall Drug building: whenever an actor leans against the rock outcropping it flexes.
While it is true that charcoal can filter out certain kinds of toxins from your system, it doesn't work on all of them. And assuming the substance poisoning the town does bind to charcoal it wouldn't of been filtered out that quickly. It showed that woman's condition improving in a matter of seconds with a single dose when it fact that process usually takes hours, or even days, and requires multiple doses.