Call of Duty is one of the most successful and prolific video game franchises since it was first released in 2003. Since then, the franchise has been developed by Infinity Ward, Treyarch, Sledgehammer Games, and Raven Software, with each developer making their mark. Each game released in the franchise adds as many details as are graphically possible, and they've only gotten more impressive over the years.
While the franchise has plenty of fans who have beaten every game more than once, there's still plenty of ingenious details that make the games play like a video game movie. There are plenty of people who find interesting things while playing a Call of Duty game, but only a few take the time to share their findings online.