* BannedInChina: ''World at War'' was banned in Japan for "gory violence against Japanese soldiers". It should be noted that the ban was quickly lifted.
* BeamMeUpScotty: ''Call of Duty'' games often use the quote "only the dead have seen the end of war," attributing it to Plato.
* CashCowFranchise: Since ''Modern Warfare 2'', each new entry in the series has become one of or simply ''the'' biggest-selling game of the year. Literature/GuinnessWorldRecords has verified the series' sales to be almost 189 million units sold, putting it behind only Creator/{{Nintendo}}'s [[Franchise/SuperMarioBros three]] [[Franchise/{{Pokemon}} biggest]] [[UsefulNotes/{{Wii}} franc]][[UsefulNotes/WiiU hises]] in terms of overall games sold, and ''that'' was in July 2014, before ''Advanced Warfare''[='=]s release.
* HeyItsThatVoice:
** [[Series/{{TwentyFour}} Jack Bauer]] voices Roebuck and Creator/GaryOldman voices Reznov in ''World at War''.
** Oldman is joined by Ed Harris and [[Film/{{Friday}} Craig]] in ''Black Ops''.
** Creator/SteveBlum voices your commander in ''Call of Duty 1'', Giovanni Ribisi is a private, and Creator/JasonStatham is British SAS member too.
*** Steve returns as Tank Dempsey in ''World at War''[='=]s NaziZombies levels.
** Brian Johnson, vocalist of Music/{{ACDC}}, voices the British commander in ''Finest Hour''.
** In ''[=CoD2=]'': Big Red One, Creator/MichaelCudlitz (Bull), Frank John Hughes (Guarnere), Richard Speight Jr (Muck), Ross McCall (Liebgott), Rick Gomez (Luz), and James Madio (Perconte) all had speaking roles. Who are they, you ask? They were in ''Series/BandOfBrothers''.
** Sam Worthington ([[Film/{{Avatar}} Jake Sully]], [[Film/ClashOfTheTitans Perseus]]) voices Alex Mason in ''Black Ops''.
** ''[=MW3=]'' was not the first time William Fichtner played a [[Film/BlackHawkDown Delta Force operator]].
** Tony Curran voices [=MacMillan=] (Baseplate) in ''Modern Warfare 3'' and has been an [[Series/UltimateForce SAS Commando before]] and played Creator/VincentVanGogh on ''Series/DoctorWho''.
** As mentioned on [[NaziZombies Call Of The Dead]], the BigBad is [[Film/NightOfTheLivingDead1968 George Romero]]. And who fights him? Creator/DannyTrejo, Michael Rooker, Creator/RobertEnglund, and Creator/SarahMichelleGellar.
** Private Polonsky from ''World at War'' is voiced by Aaron Stanford ([[Film/XMen Pyro]]).
** Edward Carlyle (playable character for the British Campaign in ''Finest Hour'') is voiced by Creator/RobinAtkinDownes. Using the same accent [[VideoGame/KingdomHearts Luxord]] has.
*** Alternatively, [[VideoGame/TeamFortress2 the Medic is a Demoman!]]
* NamesTheSame: There are three important characters who shared the last name Petrenko in the series (Mikhail in ''[=CoD=]'' 1, Yuri in ''UO''[[labelnote:*]]Has nothing to do with the Yuri from ''[=MW3=]'' either[[/labelnote]], and Dimitri). None of them are related to each other.
* StreisandEffect: ''World at War'' became one of the most popular Xbox 360 games in Japan for a time, even though it was officially banned due to [[LudicrousGibs what typically happens to the Japanese soldiers in-game]].
* WhyFandomCantHaveNiceThings: Tactical Insertions in online multiplayer. Originally debuting in ''[[VideoGame/ModernWarfare Modern Warfare 2]]'', they were intended to allow players to choose where they would respawn after their next death. However some of the community used Tac Inserts as a way to boost for easy XP, unlockable equipment and camos, and easy killstreaks. As a result, Tac Inserts were banished to the Infected game mode in both ''VideoGame/CallOfDutyGhosts'' and ''VideoGame/CallOfDutyAdvancedWarfare'', though this has not discouraged boosting.