Well, it should be obvious from the severed arm. I mean with the cost of things these days, wouldn’t you be willing to give at least as much for an alien encounter?
Geez, this one’s simple. The cadaver represents the Nixon regime, and the aliens are the journalists who broke the Watergate story. The car and the motorcycle are just diversions to keep the real story from being too obvious. Otherwise, you could read the motorcycle as a representation of the Chinese People’s Liberation Army, and the car the US administration trying to befriend Beijing in a cold war tactic.
You see, it all started with the Templar Knights…