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There was some sort of job system cut from the game. It involved Vito being able to take jobs from different characters, but not much is left besides dialogue in the game's files.
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According to leftover text in the games files, it appears that there were originally plans to include some type of fighting club in the game.
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The games files include suggestions that a large number of missions went unused. There were also missions that seem to take place during the WWII chapter.
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The games files include text referencing multiple endings. During development 2K stated there would be multiple endings, but they were missing from the final version.
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The Playboy magazines scattered throughout the game are all anachronistic; the game takes place between 1945 and 1951, but Playboy Magazine was not founded until 1953, and the images placed in the game were published between 1958, seven years after the end of the game, to 1968, seventeen years after the end of the game. The 19 Playboys added in the DLC "Joe's Adventures" range from 1960 to 1969, with a single image added from 2007, fifty-six years after the setting's era.
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Many features of the game were cut, but are still in the files. These include buses, drive-bys, difficulty selection, racing, a subway system, taxis and sitting.
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However, considering that Mafia II can take roughly 12 hours to beat while The House of the Dead: Overkill takes roughly 4 hours to beat, the latter game technically has a greater concentration of swears in a shorter amount of time than Mafia II.
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