Dr. Gilmore's driver's license says that it was issued by Central City District. Driver's licenses in America are issued by the state and would have the name of the state at the top, not the individual city.
Khione says she cannot expel the cobalt radiation from Allegra because she can only expel the unnatural from people's bodies and cobalt is part of the natural order. Halon is also part of the natural order (being a compound of elements) and therefore she shouldn't have been able to affect the incapacitated workers at CCC Media. One could argue that she didn't expel the halon from their bodies, just helped their bodies recover from its effects, but then surely Khione could have come up with a similar workaround for Allegra.