Mariah Carey was scheduled to film a cameo. However, her scenes were never filmed. Will Ferrell recalled that Carey showed up four hours late, then didn't want to do the scene she had agreed to do. Carey then delayed production, as she didn't want to sing the song, one of her own, that she was supposed to sing. This would have required the legal department to clear the song. Carey also required her trailer to be filled with white flowers and stuffed animals of lambs. Carey's scene was ultimately not filmed.
Will Ferrell (Scott), Andy Buckley (Craig), Rob Huebel (Officer Chandler), and Randall Park (wall-street guy doing cocaine) appeared on The Office (2005). Amy Poehler (Kate), Jason Mantzoukas (Frank), Lennon Parham (Martha), and Nick Kroll (Bob) appeared on Parks and Recreation (2009). Jason Mantzoukas appeared on Brooklyn Nine-Nine (2013). All three shows featured Michael Schur as a Creator, Writer, or Producer.
The trivia item below may give away important plot points.
When Officer Chandler and Councilman Bob go to the house with all of the casino activity, they just walk in without knocking, and with no search warrant. Therefore, no one could be arrested, and no money could be confiscated, due to what would be an illegal search and seizure.