* ActorAllusion:
** Hoitz is basically [[Film/TheDeparted Dignam]], reassigned and demoted instead of [[spoiler:left on his own to kill off Sullivan]] as per SurprisinglyRealisticOutcome. [[spoiler:Bonus points for Gamble ambushing Hoitz in his own apartment.]]
*** Also, when Terry is in group therapy for officers who have had to fire their weapons in the line of duty, everyone but him is extremely proud of themselves. In ''Film/TheDeparted'', Creator/LeonardoDiCaprio's character tells his therapists that cops who cry about having to fire a weapon is something made-up for tv, and that real cops love it.
** He could also be the [[Film/MaxPayne other]] Wahlberg's cop role. Made particularly obvious with a non sequitur slo-mo pub crawl and sliding backwards across a table firing GunsAkimbo.
** And Gamble yelling at length about injuries (or even a ''hangover'') comes all the way from his role in the first two ''Film/AustinPowers'' movies.
*** Speaking of hangovers, Rob Riggle demands his taser back from a class of schoolchildren, parodying his OneSceneWonder role in ''Film/TheHangover''.
** While doing Creator/SamuelLJackson's paperwork, Will Ferrell hums the theme from ''S.W.A.T.'' Jackson played Hondo in TheMovie.
** And the theme from ''Series/{{Bewitched}}''. Will Ferrell played Darrin in Film/{{Bewitched}}.
* {{Blooper}}:
** Noticeably, when the red Prius's rear door is replaced with a gray door. Later, when the car is on a train, the door is red, and a few scenes later, the door is gray again.
** Also after the explosion, his wooden gun is in its holster, then on the ground, then in its holster again.
* FakeAustralian: Creator/RayStevenson, born in Northern Ireland, raised in northern England, as Australian Roger Wesley.
* PlayingAgainstType: For a long time now, Ferrell has mostly been known for playing immature {{Man Child}}ren. His portrayal of the nerdy, straight-laced, and prudish Allen Gamble is marked departure from that norm.