Select "New Game" at the main menu, then select "Season". Choose an empty saved game slot then enter one of the following case-sensitive profile names to activate the corresponding cheat function.

All bonuses:
Enter IWantIt as a case-sensitive profile name.

Extra $999,999:
Enter Loaded as a case-sensitive profile name.

Rocket cars:
Enter HotRodz as a case-sensitive profile name.

All trophy room items:
Enter FilMeUp as a case-sensitive profile name.