In fact, the story line is loosely inspired by the story of Joseph D. Pistone, aka "Donnie Brasco".
The ending notes and music during the credits (Sid Vicious' version of Frank Sinatra's "My Way") are a reference to the 1990 film Goodfellas.
On one of the days in the calendar, you can notice Nelson has the same tree Charlie Brown has in A Charlie Brown Christmas.
This is the second time since season 19 that a recurring character gets killed in an episode.
This is the last episode to air in 2010.
In this episode, it is stated that while Americans are already waking up from the New Year party and it's already January 1st, Samoa is still celebrating the New Year. Though this was true in 2010 when this episode was released, it has since changed. In 2011, December 30th was omitted from local calendars, in order to change the time zone from UTC-11 to UTC+13.
Moe burns down his bar to avoid the responsibility of installing a ladies room, but in "The Homer They Fall" he was using the ladies room as an office.