Frank Vincent (Salvatore Leone), Sondra James (Ma Cipriani) and Guru (8-Ball) are the only prominent actors to return from Grand Theft Auto III (2001), as well as returning radio characters. Other returning characters from the third installment were voiced by different actors.
First time motorcycles have been used in Liberty City.
Was originally released on the Sony PlayStation Portable (PSP) in October 2005, and later released for the PlayStation 2 in June 2006.
It is the first time you can see a complete overview of the Liberty City map in game as you couldn't see a complete layout of the same map in Grand Theft Auto III (2001).
The cutscene for the mission "Crazy '69" seems like it was intended for a completely different mission, as Leon appears to be going with Toni, but he doesn't appear in the mission and the mission is simply a rampage against the Forellis.