- You'll see many different vehicles on the screen at the same time. This was a problem which has been fixed since previous iterations, whereby you'd see many of the same vehicle in certain areas.
- The controls are the same as they were for Liberty City Stories
- Vic will receive text messages on a pager. This is actually how Claude received messages in GTA3.
- The invitingly named Chunder Wheel, (the big ferris wheel) is in the centre of the city.
- You'll need the helicopter in many missions in the later part of the game.
Thanks to Medalion Man @ GTAForums for the information.