1. Their name comes from (I think) Peter Bergman, himself, as he was into astrology when they got together to record some of their first comedy bits. He said that all present had astrological fire signs.
2. Rush Limbaugh actually praised the work of the Firesign theater on his show back in the Clinton era and went on to use their sketch of "Beat the Reaper" as a metaphor for "Hillarycare."