Bug with which you can ski (drive on one side) on water without reseting. In video I have done it using invisible wall and water (which will reset you). In video I traveled small distance but you can go much further with better timing. Video:

How to do it: Use nitro to run into a wall and just before you hit the wall drift so you hit the wall when your car jumps. Hopefully you shoud be traveling on water (or some other surface).

I would wanted to speedrun sometimes later but I don't very much about speedrunning so I just look for bugs and things like that.