
The DVD contains a "making-of" featurette and a level walkthrough by the developers.

The Collector's Edition contains the standard retail game and a DVD containing a documentary film entitled "Great SAS Missions", which consists of archive footage of the SAS in action and accounts from former SAS members. The game was released as a standard version and a collector's edition. The demo includes one level, "The Bog", which showcases the advanced night vision and associated graphics capabilities. A single-player demo for the PC was released on October 11 as a Yahoo! download. Three multiplayer maps were available for play: "Crash", "Vacant", and "Overgrown". The maximum rank for the beta was initially level 16, but was increased to level 25 towards the end of the beta.

It was originally only for residents of the U.S., but was later available to other countries. The beta test was designed to test the servers, find glitches, and help balance out the weapons. An Xbox 360 Call of Duty 4: Modern Warfare public beta test was announced on August 30. The first Call of Duty 4: Modern Warfare trailer featuring game footage was released on April 28. Charlie Oscar Delta is derived from the NATO phonetic alphabet and the initials of Call of Duty. Charlie Oscar Delta features a ranking system that allows users to complete missions to increase their rank and compete for prizes.

On April 27, 2007, the day before the release of the game's trailer, Infinity Ward launched a website called "Charlie Oscar Delta" to provide information on the game.
