I like how half the conspiracy theories are already coming true. Like the rumors that Johnson thought JFK was retaliation for a Vietnam assassination. Turns out he actually thought that.
One neat revelation was that the Soviet Union was shocked by it, rang their church bells for him, and immediately ordered Soviet intelligence to find out what happened. (aka they didn't want him / plan for him to die.) They also thought that it might have been some fringe ultra-right actors that ordered his assassination.