Super Mario Galaxy Easter eggs

Five 1-ups?
You know the Mailtoad that's by the Toad Brigade ship? He moves eventually, but he's kinda pinkish purple colored. Anyway, if a picture of an envelope appears above his head, talk to him, get through the letter and say yes. There's five 1-ups, and there's also a 1-up in that box by the Toad Brigade when it's parked at the observatory.