Big
Heads:
At the main menu type in big heads
Get up
faster:
Once you fall you press tab and you will get up immediately.
Nose
Wheelie:
To do a nose wheelie, go of a small jump with a clear landing space.
Before you land, lean forward until your bike is vertical. Hold the
brake button and you should hold a nose wheelie. But you can't try to go
over a hill while holding it.