Just a note on the 1up = Hearts instead of mushrooms question - I've always assumed that it's because the 1ups in the regular games are Green Mushrooms as opposed to Red Mushrooms, and the GB had a black and white screen. So Nintendo made it a compleyely different item starting in SML1 to make it easier to differentiate.
I've never read that officially, mind you, but it makes sense as an explanation.
I've never read that officially, mind you, but it makes sense as an explanation.