Just bury these in mind!
Always Special, Cool Specials, Flame, Kid Mode, Moon Gravity, Perfect Manual, Perfect Rail, Perfect Skitch and Rollerskates can all be unlocked the good and honest way by getting 129/129 goals. Alternative Ending is unlocked by completing story mode twice. Create-a-deck mode requires you to beat slamma Jamma in story mode. Iron man is unlocked by completing beginners story mode and the classic Hangar from THPS2 can be unlocked by finding the 'old skool' icon on the moscow map.