When playing as Sweet Tooth if you look at the head on the top of his truck it always faces towards your nearest opponent listed above your radar
The second Twisted Metal after the original to feature the electric ramps to increase your health meter.
Many people think shooting the black cube on top of the car crusher in the junkyard level unlocks Warhawk (The Helicopter) however this only unlocks Warhawk's Level not Warhawk (The Helicopter)
Warhawk (The Helicopter) was intended to be a playable character in Twisted Metal Black but was cut from the video game due to technical difficulties and would control too much like a vehicle in mid-air.
All the story in the game are actually taken place in Sweet Tooth head