Oldman is joined by Ed Harris and Craig in Black Ops.
Steve Blum voices your commander in Call of Duty 1, Giovanni Ribisi is a private, and Jason Statham is British SAS member too.
Steve returns as Tank Dempsey in World At War's Nazi Zombies levels.
Brian Johnson, vocalist of AC/DC voices the British commander in Finest Hour.
In CoD2: Big Red One, Michael Cudlitz (Bull), Frank John Hughes (Guarnere), Richard Speight Jr (Muck), Ross Mc Call (Liebgott), Rick Gomez (Luz), and James Madio (Perconte) all had speaking roles. Who are they, you ask? They were in Band of Brothers.
Private Polonsky from "World At War" is voiced by Aaron Stanford (Pyro).
Name's the Same: There are 3 important characters who shared the last name Petrenko in the series (Mikhail in COD1, Yuri in UO* Has nothing to do with the Yuri from MW3 either, and Dimitri). None of them are related to each other.
Technology Marches On: Just try installing Call of Duty 2 on a Vista system. If it's Vista 32, you can flip a coin to determine if it will work. If it's 64, you're more into "flip an oil tanker" territory.