Homer (like most of us in RealLife) waits until the last minute to file his tax return, and the IRS has jailtime in store for Homer -- unless Homer plays spy to retrieve a trillion-dollar bill that Mr. Burns was supposed to deliver to post-WorldWarII Europe to pay for damages done to the cities and stimulate the economy.

* BoxedCrook: Homer agrees to work as an IRS snitch to avoid going to jail.
* HistoricalInJoke: Mr. Burns has the suit Creator/CharlieChaplin was buried in, which suggests that Burns was the one who stole Chaplin's coffin in 1978, a few months after Chaplin's death and funeral.
* ScrewTheRulesIHaveMoney: How Mr. Burns intends to avoid punishment.