I don't usually waste my time with these things, but it turns out that on Lego Star Wars for the Wii (of which I am a big fan and highly recommend) it doesn't reset the 'Extras' when you load another game.

Therefore I was able to kick up to 3840x cash multiplier and a few other extras in my saved game, which is almost finished, then load my son's game and make a stack of cash for him

News at 7, I guess.