Something I noticed missing from the strategy guide is how Crank it up impact the mode in more ways than just increasing scoring and adding time. It can also turn a mode into a do or die with no chance to repeat or it can add available targets or remove targets. It all depends on the mode.
For example with Walk this way, Crank it up will remove the orbits and make the mode do or die where if you drain before collecting, even with plenty of time on the clock, it will mark the mode as complete but not award your bonus scoring.
Crank it up is such a great feature!