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During the opening video to the mission "Safehouse" it can be seen that Nikolai's safe-house in Hamburg, Germany is at the Dietmar-Koel-Strasse and Reimarusstrasse junction in Hamburg, close to the Landungsbruecken. An area occupied by small stores and indeed quite a few apartments.
In the mission "Aftermath", if you get out of the back of the Chinook and turn left, there is a playground directly ahead. As you approach the playground, you will hear the haunting sounds of children playing.
Despite its title, this is actually the 8th game in the "Call of Duty" series.
Many of the minor soldier characters have the last names of the game's programmers.
The playable character 'Soap' MacTavish had no voice actor until Call of Duty: Modern Warfare 2.
In the flashback mission Captain Price indicates that the mission is a decade (10 years) after the Chernobyl disaster, this would mean that the flashback mission occurred in 1996 as the Chernobyl disaster was in 1986. The flashback mission is said to be 15 years in the past, this would mean that the year the game is set is 2011.